Linux Classes
Share This With a Friend  

zip command help

       zip,  zipcloak,  zipnote,  zipsplit - package and compress
       (archive) files


       zip     [-aABcdDeEfFghjklLmoqrRSTuvVwXyz!@$]     [-b path]
       [-n suffixes]  [-t mmddyyyy]  [-tt mmddyyyy]  [  zipfile [
       file1 file2 ...]] [-xi list]
       zipcloak [-dhL] [-b path] zipfile
       zipnote [-hwL] [-b path] zipfile
       zipsplit [-hiLpst] [-n size] [-b path] zipfile


       zip is a compression and file packaging utility for  Unix,
       VMS,  MSDOS, OS/2, Windows NT, Minix, Atari and Macintosh,
       Amiga and Acorn RISC OS.
       It is analogous to a  combination  of  the  UNIX  commands
       tar(1)  and compress(1) and is compatible with PKZIP (Phil
       Katz's ZIP for MSDOS systems).
       A companion program  (unzip(1L)),  unpacks  zip  archives.
       The zip and unzip(1L) programs can work with archives pro­
       duced by PKZIP,  and  PKZIP  and  PKUNZIP  can  work  with
       archives  produced  by zip.  zip version 2.3 is compatible
       with PKZIP 2.04.  Note that PKUNZIP  1.10  cannot  extract
       files  produced  by  PKZIP  2.04  or zip 2.3. You must use
       PKUNZIP 2.04g  or  unzip  5.0p1  (or  later  versions)  to
       extract them.
       For a brief help on zip and unzip, run each without speci­
       fying any parameters on the command line.
       The program is useful for packaging a  set  of  files  for
       distribution;  for  archiving  files;  and for saving disk
       space by temporarily compressing unused files or  directo­
       The  zip  program puts one or more compressed files into a
       single zip archive, along with information about the files
       (name,  path, date, time of last modification, protection,
       and check  information  to  verify  file  integrity).   An
       entire  directory  structure  can  be  packed  into  a zip
       archive with a single command.  Compression ratios of  2:1
       to 3:1 are common for text files.  zip has one compression
       method (deflation) and can also store files  without  com­
       pression.  zip automatically chooses the better of the two
       for each file to be compressed.
       When given the name of an existing zip archive,  zip  will
       and  contains  foo/file1  and foo/file2, and the directory
       foo contains the files foo/file1 and foo/file3, then:
              zip -r foo foo
       will replace foo/file1 in  and  add  foo/file3  to    After   this,   contains  foo/file1,
       foo/file2, and foo/file3, with  foo/file2  unchanged  from
       If  the  file  list is specified as -@, [Not on MacOS] zip
       takes the list of input files from standard input.   Under
       UNIX,  this  option can be used to powerful effect in con­
       junction  with  the  find(1)  command.   For  example,  to
       archive  all  the  C source files in the current directory
       and its subdirectories:
              find . -name "*.[ch]" -print | zip source -@
       (note that the pattern must be quoted to  keep  the  shell
       from  expanding  it).   zip will also accept a single dash
       ("-") as the zip file name, in which case  it  will  write
       the zip file to standard output, allowing the output to be
       piped to another program. For example:
              zip -r - . | dd of=/dev/nrst0 obs=16k
       would write the zip output directly to  a  tape  with  the
       specified  block  size  for  the purpose of backing up the
       current directory.
       zip also accepts a single dash ("-") as the name of a file
       to be compressed, in which case it will read the file from
       standard input, allowing zip to take  input  from  another
       program. For example:
              tar cf - . | zip backup -
       would  compress the output of the tar command for the pur­
       pose of backing up the current directory.  This  generally
       produces  better  compression  than  the  previous example
       using the -r option, because zip  can  take  advantage  of
       redundancy between files. The backup can be restored using
       the command
              unzip -p backup | tar xf -
       When no zip file name is given and stdout is not a  termi­
       nal,  zip  acts as a filter, compressing standard input to
       standard output.  For example,
              tar cf - . | zip | dd of=/dev/nrst0 obs=16k
              tar cf - . | zip - - | dd of=/dev/nrst0 obs=16k
       zip archives created in this manner can be extracted  with
       the program funzip which is provided in the unzip package,
       or by gunzip which is provided in the  gzip  package.  For
       dd if=/dev/nrst0  ibs=16k | funzip | tar xvf -
       When  changing  an  existing zip archive, zip will write a
       temporary file with the new contents, and only replace the
       old  one  when the process of creating the new version has
       been completed without error.
       If the name of the zip archive does not contain an  exten­
       sion,  the  extension  .zip  is added. If the name already
       contains an extension other than .zip the existing  exten­
       sion is kept unchanged.


       -a     [Systems using EBCDIC] Translate file to ASCII for­
       -A     Adjust self-extracting executable archive.  A self-
              extracting   executable   archive   is  created  by
              prepending the SFX stub to an existing archive. The
              -A  option  tells  zip  to adjust the entry offsets
              stored in the archive to  take  into  account  this
              "preamble" data.
       Note: self-extracting archives for the Amiga are a special
       case.  At present, only the Amiga port of Zip  is  capable
       of adjusting or updating these without corrupting them. -J
       can be used to remove the SFX stub if other  updates  need
       to be made.
       -B     [VM/CMS  and  MVS]  force  file  to  be read binary
              (default is text).
       -Bn    [TANDEM] set Edit/Enscribe formatting options  with
              n defined as
              bit  0: Don't add delimiter (Edit/Enscribe)
              bit  1:  Use  LF  rather  than  CR/LF  as delimiter
              bit  2: Space fill record to maximum record  length
              bit  3: Trim trailing space (Enscribe)
              bit  8:  Force 30K (Expand) large read for unstruc­
              tured files
       -b path
                     zip -b /tmp stuff *
              will put the temporary zip archive in the directory
              /tmp, copying over to the current  direc­
              tory  when  done.  This  option is only useful when
              updating an existing archive, and the  file  system
              containing  this  old  archive does not have enough
              space to hold both old and new archives at the same
       -c     Add  one-line  comments for each file.  File opera­
              tions (adding, updating) are done  first,  and  the
              user  is  then  prompted for a one-line comment for
              each file.  Enter the comment followed  by  return,
              or just return for no comment.
       -d     Remove  (delete)  entries  from a zip archive.  For
                     zip -d foo foo/tom/junk foo/harry/\* \*.o
              will remove the  entry  foo/tom/junk,  all  of  the
              files  that  start  with foo/harry/, and all of the
              files that end with .o (in any  path).   Note  that
              shell  pathname  expansion  has been inhibited with
              backslashes, so that zip  can  see  the  asterisks,
              enabling  zip  to  match on the contents of the zip
              archive instead of  the  contents  of  the  current
              Under  MSDOS,  -d is case sensitive when it matches
              names in the zip archive.  This requires that  file
              names  be entered in upper case if they were zipped
              by PKZIP on an MSDOS system.
       -df    [MacOS] Include only data-fork of files zipped into
              the  archive.   Good for exporting files to foreign
              operating-systems.  Resource-forks will be  ignored
              at all.
       -D     Do not create entries in the zip archive for direc­
              tories.  Directory entries are created  by  default
              so  that  their  attributes can be saved in the zip
              archive.  The environment variable  ZIPOPT  can  be
              used  to  change  the  default options. For example
              under Unix with sh:
                     ZIPOPT="-D"; export ZIPOPT
              (The variable ZIPOPT can be  used  for  any  option
              except  -i and -x and can include several options.)
              ronment variable.
       -e     Encrypt the contents of the  zip  archive  using  a
              password  which  is  entered  on  the  terminal  in
              response to a prompt (this will not be  echoed;  if
              standard  error is not a tty, zip will exit with an
              error).  The password prompt is  repeated  to  save
              the user from typing errors.
       -E     [OS/2]  Use  the  .LONGNAME  Extended Attribute (if
              found) as filename.
       -f     Replace (freshen) an  existing  entry  in  the  zip
              archive  only if it has been modified more recently
              than the version already in the zip archive; unlike
              the update option (-u) this will not add files that
              are not already in the zip archive.  For example:
                     zip -f foo
              This command should be run from the same  directory
              from  which the original zip command was run, since
              paths stored in zip archives are always relative.
              Note that  the  timezone  environment  variable  TZ
              should  be  set  according to the local timezone in
              order for the -f , -u and -o options to  work  cor­
              The  reasons  behind  this  are somewhat subtle but
              have to do with the differences between  the  Unix-
              format  file  times (always in GMT) and most of the
              other operating systems (always local time) and the
              necessity  to  compare the two.  A typical TZ value
              is ``MET-1MEST'' (Middle European time  with  auto­
              matic  adjustment  for  ``summertime''  or Daylight
              Savings Time).
       -F     Fix the zip archive. This option  can  be  used  if
              some portions of the archive are missing. It is not
              guaranteed to work, so you MUST make  a  backup  of
              the original archive first.
              When  doubled  as in -FF the compressed sizes given
              inside the damaged archive are not trusted and  zip
              scans for special signatures to identify the limits
              between the archive members. The single -F is  more
              reliable  if  the  archive is not too much damaged,
              for example if it has only been truncated,  so  try
              this option first.
              Neither option will recover archives that have been
              may show that some files have a bad CRC. Such files
              cannot  be  recovered; you can remove them from the
              archive using the -d option of zip.
       -g     Grow (append to) the specified zip archive, instead
              of creating a new one. If this operation fails, zip
              attempts to restore the  archive  to  its  original
              state.  If the restoration fails, the archive might
              become  corrupted.  This  option  is  ignored  when
              there's  no  existing  archive or when at least one
              archive member must be updated or deleted.
       -h     Display the zip help information (this also appears
              if zip is run with no arguments).
       -i files
              Include only the specified files, as in:
                     zip -r foo . -i \*.c
              which will include only the files that end in .c in
              the current directory and its subdirectories. (Note
              for PKZIP users: the equivalent command is
                     pkzip -rP foo *.c
              PKZIP does not allow recursion in directories other
              than the current one.)  The  backslash  avoids  the
              shell  filename  substitution,  so  that  the  name
              matching is performed by zip at all directory  lev­
              Also possible:
                     zip -r foo  . -i@include.lst
              which  will  only  include the files in the current
              directory and its  subdirectories  that  match  the
              patterns in the file include.lst.
       -I     [Acorn  RISC  OS]  Don't  scan through Image files.
              When used, zip will not consider Image  files  (eg.
              DOS  partitions  or  Spark archives when SparkFS is
              loaded) as directories but will store them as  sin­
              gle files.
              For  example, if you have SparkFS loaded, zipping a
              Spark archive will result in a zipfile containing a
              directory  (and  its  content)  while using the 'I'
              option will result in a zipfile containing a  Spark
              archive.  Obviously  this  second case will also be
              obtained (without the 'I' option) if SparkFS  isn't
              path),  and  do  not  store  directory  names.   By
              default,  zip will store the full path (relative to
              the current path).
       -jj    [MacOS] record Fullpath (+ Volname).  The  complete
              path  including  volume  will be stored. By default
              the relative path will be stored.
       -J     Strip any prepended data (e.g. a SFX stub) from the
       -k     Attempt  to  convert the names and paths to conform
              to MSDOS, store only the MSDOS attribute (just  the
              user write attribute from UNIX), and mark the entry
              as made under MSDOS (even though it was  not);  for
              compatibility with PKUNZIP under MSDOS which cannot
              handle certain names such as those with two dots.
       -l     Translate the Unix end-of-line  character  LF  into
              the  MSDOS convention CR LF. This option should not
              be used on binary files.  This option can  be  used
              on  Unix  if  the  zip file is intended for PKUNZIP
              under MSDOS. If the input files already contain  CR
              LF,  this option adds an extra CR. This ensure that
              unzip -a on Unix will get back an exact copy of the
              original file, to undo the effect of zip -l.
       -ll    Translate the MSDOS end-of-line CR LF into Unix LF.
              This option should not be  used  on  binary  files.
              This option can be used on MSDOS if the zip file is
              intended for unzip under Unix.
       -L     Display the zip license.
       -m     Move the specified  files  into  the  zip  archive;
              actually, this deletes the target directories/files
              after making the specified zip archive. If a direc­
              tory  becomes empty after removal of the files, the
              directory is also removed. No  deletions  are  done
              until  zip  has  created the archive without error.
              This is useful for conserving disk  space,  but  is
              potentially  dangerous  so it is recommended to use
              it in combination  with  -T  to  test  the  archive
              before removing all input files.
       -n suffixes
              Do  not  attempt  to  compress files named with the
              given suffixes.  Such files are simply  stored  (0%
              compression)  in  the  output zip file, so that zip
              doesn't waste its time  trying  to  compress  them.
              The  suffixes  are  separated  by  either colons or
              semicolons.  For example:
              will copy everything from  foo  into,  but
              will  store  any files that end in .Z, .zip, .tiff,
              .gif, or  .snd  without  trying  to  compress  them
              (image  and  sound  files often have their own spe­
              cialized compression  methods).   By  default,  zip
              does not compress files with extensions in the list
      Such files are stored
              directly  in  the  output archive.  The environment
              variable ZIPOPT can be used to change  the  default
              options. For example under Unix with csh:
                     setenv ZIPOPT "-n"
              To attempt compression on all files, use:
                     zip -n : foo
              The  maximum  compression  option  -9 also attempts
              compression on all files regardless of extension.
              On Acorn RISC OS systems the suffixes are  actually
              filetypes  (3  hex  digit  format). By default, zip
              does not compress files with filetypes in the  list
              DDC:D96:68E  (i.e.  Archives, CFS files and PackDir
       -N     [Amiga, MacOS] Save Amiga  or  MacOS  filenotes  as
              zipfile comments. They can be restored by using the
              -N option of unzip. If -c is  used  also,  you  are
              prompted  for comments only for those files that do
              not have filenotes.
       -o     Set the "last modified" time of the zip archive  to
              the  latest  (oldest)  "last  modified"  time found
              among the entries in the zip archive.  This can  be
              used without any other operations, if desired.  For
              zip -o foo
              will change the last modified time  of  to
              the latest time of the entries in
       -P password
              use  password  to encrypt zipfile entries (if any).
              THIS IS INSECURE!  Many multi-user  operating  sys­
              tems  provide  ways for any user to see the current
              command line of any other user; even on stand-alone
              systems  there  is  always  the threat of over-the-
              shoulder peeking.  Storing the  plaintext  password
              ing,  interactive  prompt to enter passwords.  (And
              where  security  is  truly  important,  use  strong
              encryption  such  as Pretty Good Privacy instead of
              the relatively weak encryption provided by standard
              zipfile utilities.)
       -q     Quiet  mode;  eliminate  informational messages and
              comment prompts.  (Useful, for  example,  in  shell
              scripts and background tasks).
       -Qn    [QDOS] store information about the file in the file
              header with n defined as
              bit  0: Don't add headers for any file
              bit  1: Add headers for all files
              bit  2: Don't wait for  interactive  key  press  on
       -r     Travel  the  directory  structure  recursively; for
                     zip -r foo foo
              In this case, all the files and directories in  foo
              are saved in a zip archive named, including
              files with  names  starting  with  ".",  since  the
              recursion  does  not use the shell's file-name sub­
              stitution mechanism.  If you wish to include only a
              specific  subset  of the files in directory foo and
              its subdirectories, use the -i  option  to  specify
              the  pattern  of  files to be included.  You should
              not use -r with the name ".*", since  that  matches
              ".."   which  will  attempt  to  zip  up the parent
              directory (probably not what was intended).
       -R     Travel the directory structure recursively starting
              at the current directory; for example:
                     zip -R foo '*.c'
              In  this  case,  all  the files matching *.c in the
              tree starting at the current directory  are  stored
              into  a  zip archive named  Note for PKZIP
              users: the equivalent command is
                     pkzip -rP foo *.c
       -S     [MSDOS, OS/2, WIN32 and ATARI] Include  system  and
              hidden files.
              [MacOS]  Includes finder invisible files, which are
              ignored otherwise.
       -t mmddyyyy
              the day of the month (1-31), and yyyy is the  year.
              The   ISO  8601  date  format  yyyy-mm-dd  is  also
              accepted.  For example:
                     zip -rt 12071991 infamy foo
                     zip -rt 1991-12-07 infamy foo
              will add all the files in foo and  its  subdirecto­
              ries that were last modified on or after 7 December
              1991, to the zip archive
       -tt mmddyyyy
              Do not operate on files modified after  or  at  the
              specified date, where mm is the month (0-12), dd is
              the day of the month (1-31), and yyyy is the  year.
              The   ISO  8601  date  format  yyyy-mm-dd  is  also
              accepted.  For example:
                     zip -rtt 11301995 infamy foo
                     zip -rtt 1995-11-30 infamy foo
              will add all the files in foo and  its  subdirecto­
              ries that were last modified before the 30 November
              1995, to the zip archive
       -T     Test the integrity of the  new  zip  file.  If  the
              check  fails,  the  old  zip  file is unchanged and
              (with the -m option) no input files are removed.
       -u     Replace (update)  an  existing  entry  in  the  zip
              archive  only if it has been modified more recently
              than the version already in the zip  archive.   For
                     zip -u stuff *
              will  add  any  new files in the current directory,
              and update any files which have been modified since
              the zip archive was last created/modified
              (note that zip will not try to pack  into
              itself when you do this).
              Note that the -u option with no arguments acts like
              the -f (freshen) option.
       -v     Verbose mode or print diagnostic version info.
              Normally, when applied  to  real  operations,  this
              option  enables the display of a progress indicator
              during compression and requests verbose  diagnostic
              out is not  redirected  to  a  file,  a  diagnostic
              screen  is  printed. In addition to the help screen
              header with  program  name,  version,  and  release
              date,  some  pointers to the Info-ZIP home and dis­
              tribution sites are given. Then, it shows  informa­
              tion  about  the  target environment (compiler type
              and version, OS version, compilation date  and  the
              enabled  optional  features  used to create the zip
       -V     [VMS] Save VMS file attributes.  zip archives  cre­
              ated  with this option will generally not be usable
              on other systems.
       -w     [VMS] Append the version number of the files to the
              name,   including   multiple   versions  of  files.
              (default: use only the most  recent  version  of  a
              specified file).
       -x files
              Explicitly exclude the specified files, as in:
                     zip -r foo foo -x \*.o
              which  will  include the contents of foo in
              while excluding all the files that end in .o.   The
              backslash  avoids  the shell filename substitution,
              so that the name matching is performed  by  zip  at
              all directory levels.
              Also possible:
                     zip -r foo foo -x@exclude.lst
              which  will  include the contents of foo in
              while excluding all the files that match  the  pat­
              terns in the file exclude.lst.
       -X     Do   not   save  extra  file  attributes  (Extended
              Attributes on  OS/2,  uid/gid  and  file  times  on
       -y     Store  symbolic  links  as such in the zip archive,
              instead  of  compressing  and  storing   the   file
              referred to by the link (UNIX only).
       -z     Prompt  for a multi-line comment for the entire zip
              archive.  The comment is ended by a line containing
              just  a  period, or an end of file condition (^D on
              UNIX, ^Z on MSDOS, OS/2, and VAX/VMS).  The comment
              can be taken from a file:
              fied digit #, where  -0  indicates  no  compression
              (store  all  files),  -1 indicates the fastest com­
              pression method (less compression) and -9 indicates
              the  slowest  compression  method (optimal compres­
              sion, ignores the suffix list).  The  default  com­
              pression level is -6.
       -!     [WIN32]  Use  priviliges (if granted) to obtain all
              aspects of WinNT security.
       -@     Take the list of input files from  standard  input.
              Only one filename per line.
       -$     [MSDOS,  OS/2,  WIN32] Include the volume label for
              the the drive holding the first  file  to  be  com­
              pressed.   If  you  want to include only the volume
              label or to force a specific drive, use  the  drive
              name as first file name, as in:
                     zip -$ foo a: c:bar


       The simplest example:
              zip stuff *
       creates the archive (assuming it does not exist)
       and puts all the files in the current directory in it,  in
       compressed  form  (the .zip suffix is added automatically,
       unless that archive name given  contains  a  dot  already;
       this allows the explicit specification of other suffixes).
       Because of the way the shell does  filename  substitution,
       files starting with "." are not included; to include these
       as well:
              zip stuff .* *
       Even this will not include  any  subdirectories  from  the
       current directory.
       To zip up an entire directory, the command:
              zip -r foo foo
       creates  the archive, containing all the files and
       directories in the directory foo that is contained  within
       the current directory.
       You may want to make a zip archive that contains the files
       in foo, without recording the directory  name,  foo.   You
       If  you are short on disk space, you might not have enough
       room to hold both the original directory  and  the  corre­
       sponding  compressed  zip  archive.  In this case, you can
       create the archive in steps using the -m option.   If  foo
       contains the subdirectories tom, dick, and harry, you can:
              zip -rm foo foo/tom
              zip -rm foo foo/dick
              zip -rm foo foo/harry
       where the first command creates, and the next  two
       add  to  it.   At  the completion of each zip command, the
       last created archive is deleted, making room for the  next
       zip command to function.


       This  section  applies only to UNIX.  Watch this space for
       details on MSDOS and VMS operation.
       The UNIX shells (sh(1) and csh(1)) do  filename  substitu­
       tion on command arguments.  The special characters are:
       ?      match any single character
       *      match any number of characters (including none)
       []     match  any  character in the range indicated within
              the brackets (example: [a-f], [0-9]).
       When  these  characters  are  encountered  (without  being
       escaped  with  a backslash or quotes), the shell will look
       for files relative to the current path that match the pat­
       tern,  and  replace  the argument with a list of the names
       that matched.
       The zip program can do the same matching on names that are
       in  the  zip archive being modified or, in the case of the
       -x (exclude) or -i (include) options, on the list of files
       to  be operated on, by using backslashes or quotes to tell
       the shell not to do the name expansion.  In general,  when
       zip encounters a name in the list of files to do, it first
       looks for the name in the file system.  If it finds it, it
       then  adds  it to the list of files to do.  If it does not
       find it, it looks for the name in the  zip  archive  being
       modified  (if it exists), using the pattern matching char­
       acters described above, if present.  For  each  match,  it
       will  add  that name to the list of files to be processed,
       unless this name matches one given with the -x option,  or
       does not match any name given with the -i option.
       The  pattern  matching  includes the path, and so patterns
       every special character (i.e. ?*[]), or the  entire  argu­
       ment must be enclosed in double quotes ("").
       In  general,  use  backslash  to  make  zip do the pattern
       matching with the -f (freshen) and  -d  (delete)  options,
       and sometimes after the -x (exclude) option when used with
       an appropriate operation (add, -u, -f, or -d).


       ZIPOPT contains default options that  will  be  used  when
              running zip
       ZIP    [Not on RISC OS and VMS] see ZIPOPT
              [RISC OS] see ZIPOPT
              [RISC OS] contains extensions separated by a : that
              will cause native filenames with one of the  speci­
              fied  extensions  to  be added to the zip file with
              basename and extension swapped.  zip
              [VMS] see ZIPOPT


       compress(1), shar(1L), tar(1), unzip(1L), gzip(1L)


       The exit status (or error  level)  approximates  the  exit
       codes defined by PKWARE and takes on the following values,
       except under VMS:
              0      normal; no errors or warnings detected.
              2      unexpected end of zip file.
              3      a generic error in the  zipfile  format  was
                     detected.   Processing  may  have  completed
                     successfully anyway;  some  broken  zipfiles
                     created by other archivers have simple work-
              4      zip was unable to allocate memory for one or
                     more  buffers during program initialization.
              5      a severe error in  the  zipfile  format  was
                     detected.   Processing probably failed imme­
              6      entry too large to be split with zipsplit
              8      zip -T failed or out of memory
              9      the user aborted zip prematurely  with  con­
                     trol-C (or similar)
              10     zip  encountered an error while using a temp
              11     read or seek error
              12     zip has nothing to do
              13     missing or empty zip file
              14     error writing to a file
              15     zip was unable to create a file to write to
              16     bad command line parameters
              18     zip could not open a specified file to read
       VMS interprets standard Unix  (or  PC)  return  values  as
       other,  scarier-looking  things,  so zip instead maps them
       into VMS-style status codes.  The current  mapping  is  as
       follows:   1 (success) for normal exit,
        and  (0x7fff000?  +  16*normal_zip_exit_status)  for  all
       errors, where the `?' is 0 (warning) for zip value  12,  2
       (error)  for  the zip values 3, 6, 7, 9, 13, 16, 18, and 4
       (fatal error) for the remaining ones.


       zip 2.3 is not compatible with PKUNZIP 1.10. Use  zip  1.1
       to  produce  zip  files  which can be extracted by PKUNZIP
       zip files produced by zip 2.3 must not be updated  by  zip
       1.1 or PKZIP 1.10, if they contain encrypted members or if
       they have been produced in a pipe  or  on  a  non-seekable
       device.  The  old versions of zip or PKZIP would create an
       archive with an incorrect format.  The  old  versions  can
       list  the  contents  of the zip file but cannot extract it
       anyway (because of the new compression algorithm).  If you
       do  not  use encryption and use regular disk files, you do
       not have to care about this problem.
       Under VMS, not all of the odd  file  formats  are  treated
       properly.  Only stream-LF format zip files are expected to
       work with  zip.   Others  can  be  converted  using  Rahul
       Dhesi's BILF program.  This version of zip handles some of
       the conversion internally.  When using Kermit to  transfer
       file  type  fixed"  on  the Vax.  In both cases, type "set
       file type binary" on MSDOS.
       Under VMS, zip hangs for file specification that uses DEC­
       net syntax foo::*.*.
       On  OS/2,  zip  cannot  match  some  names,  such as those
       including an exclamation mark or a hash sign.  This  is  a
       bug  in  OS/2  itself:  the 32-bit DosFindFirst/Next don't
       find such names.  Other programs such as GNU tar are  also
       affected by this bug.
       Under OS/2, the amount of Extended Attributes displayed by
       DIR is (for compatibility)  the  amount  returned  by  the
       16-bit  version  of DosQueryPathInfo(). Otherwise OS/2 1.3
       and 2.0 would report different  EA  sizes  when  DIRing  a
       file.   However,  the  structure  layout  returned  by the
       32-bit DosQueryPathInfo() is  a  bit  different,  it  uses
       extra padding bytes and link pointers (it's a linked list)
       to have all fields on 4-byte boundaries for portability to
       future RISC OS/2 versions. Therefore the value reported by
       zip (which uses this 32-bit-mode size) differs  from  that
       reported  by DIR.  zip stores the 32-bit format for porta­
       bility, even the 16-bit MS-C-compiled version  running  on
       OS/2 1.3, so even this one shows the 32-bit-mode size.


       Copyright  (C)  1990-1997  Mark  Adler,  Richard B. Wales,
       Jean-loup Gailly, Onno van der  Linden,  Kai  Uwe  Rommel,
       Igor Mandrichenko, John Bush and Paul Kienitz.  Permission
       is granted to any individual or institution to use,  copy,
       or redistribute this software so long as all of the origi­
       nal files are included, that it is not  sold  for  profit,
       and that this copyright notice is retained.
       Please   send  bug  reports  and  comments  by  email  to:  For bug reports,  please  include
       the  version of zip (see zip-h ), the make options used to
       compile it see zip-v ), the machine and  operating  system
       in use, and as much additional information as possible.


       Thanks  to  R.  P. Byrne for his Shrink.Pas program, which
       inspired this project, and from which the shrink algorithm
       was  stolen; to Phil Katz for placing in the public domain
       the zip file format, compression format, and .ZIP filename
       format;  to  Haruhiko Okumura and Leonid Broukhis for pro­
       viding some useful ideas for the compression algorithm; to
       Keith  Petersen, Rich Wales, Hunter Goatley and Mark Adler
       for providing a mailing list and ftp site for the Info-ZIP
       group  to use; and most importantly, to the Info-ZIP group
       itself (listed in  the  file  infozip.who)  without  whose
       tireless  testing  and  bug-fixing  efforts a portable zip
       would not have been possible.   Finally  we  should  thank
       (blame)  the  first  Info-ZIP moderator, David Kirschbaum,
       for getting us into this mess in  the  first  place.   The
       manual page was rewritten for UNIX by R. P. C. Rodgers.


Comments - most recent first
(Please feel free to answer questions posted by others!)

No comments yet

I welcome your comments. However... I am puzzled by many people who say "Please send me the Linux tutorial." This website *is* your Linux Tutorial! Read everything here, learn all you can, ask questions if you like. But don't ask me to send what you already have. :-)

NO SPAM! If you post garbage, it will be deleted, and you will be banned.
Notify me about new comments on this page
Hide my email

Ask Bob Rankin - Free Tech Support

Copyright © by - Privacy Policy
All rights reserved - Redistribution is allowed only with permission.