unzipsfx



UNZIPSFX(1L)                                                      UNZIPSFX(1L)




NAME

       unzipsfx - self-extracting stub for prepending to ZIP archives


SYNOPSIS

       <name  of  unzipsfx+archive  combo>  [-cfptuz[ajnoqsCLV$]] [file(s) ...
       [-x xfile(s) ...]]


DESCRIPTION

       unzipsfx is a modified version of unzip(1L) designed to be prepended to
       existing  ZIP  archives  in  order  to  form  self-extracting archives.
       Instead of taking its first non-flag argument to be the  zipfile(s)  to
       be  extracted,  unzipsfx  seeks  itself  under the name by which it was
       invoked and tests or extracts the contents  of  the  appended  archive.
       Because the executable stub adds bulk to the archive (the whole purpose
       of which is to be as small as possible), a  number  of  the  less-vital
       capabilities  in  regular unzip have been removed.  Among these are the
       usage (or help) screen, the listing and diagnostic  functions  (-l  and
       -v),   the   ability  to  decompress  older  compression  formats  (the
       ‘‘reduce,’’  ‘‘shrink’’  and  ‘‘implode’’  methods).   The  ability  to
       extract  to a directory other than the current one can be selected as a
       compile-time option, which is now enabled  by  default  since  UnZipSFX
       version  5.5.   Similary,  decryption  is  supported  as a compile-time
       option but should be  avoided  unless  the  attached  archive  contains
       encrypted files. Starting with release 5.5, another compile-time option
       adds a simple ‘‘run command after extraction’’ feature.   This  feature
       is  currently  incompatible with the ‘‘extract to different directory’’
       feature and remains disabled by default.

       Note that self-extracting archives made with unzipsfx are no  more  (or
       less)  portable  across  different  operating systems than is the unzip
       executable itself.  In general a self-extracting archive made on a par-
       ticular Unix system, for example, will only self-extract under the same
       flavor of Unix.  Regular unzip may still be used to extract the  embed-
       ded  archive  as  with  any normal zipfile, although it will generate a
       harmless warning about extra bytes at the  beginning  of  the  zipfile.
       Despite this, however, the self-extracting archive is technically not a
       valid ZIP archive, and PKUNZIP may be unable to  test  or  extract  it.
       This limitation is due to the simplistic manner in which the archive is
       created; the internal directory structure is not updated to reflect the
       extra bytes prepended to the original zipfile.


ARGUMENTS

       [file(s)]
              An  optional  list  of archive members to be processed.  Regular
              expressions (wildcards) similar to those in Unix egrep(1) may be
              used to match multiple members.  These wildcards may contain:

              *      matches a sequence of 0 or more characters

              ?      matches exactly 1 character

              [...]  matches  any  single character found inside the brackets;
                     ranges are specified by a beginning character, a  hyphen,
                     and  an  ending  character.  If an exclamation point or a
                     caret (‘!’ or ‘^’) follows the  left  bracket,  then  the
                     range  of  characters within the brackets is complemented
                     (that is,  anything  except  the  characters  inside  the
                     brackets is considered a match).

              (Be  sure  to quote any character that might otherwise be inter-
              preted or modified by the operating system,  particularly  under
              Unix and VMS.)

       [-x xfile(s)]
              An optional list of archive members to be excluded from process-
              ing.   Since  wildcard  characters  match  directory  separators
              (‘/’),  this option may be used to exclude any files that are in
              subdirectories.  For example, ‘‘foosfx  *.[ch]  -x  */*’’  would
              extract  all  C  source files in the main directory, but none in
              any subdirectories.  Without the -x option, all C  source  files
              in all directories within the zipfile would be extracted.

       If unzipsfx is compiled with SFX_EXDIR defined, the following option is
       also enabled:

       [-d exdir]
              An optional directory to which to extract  files.   By  default,
              all files and subdirectories are recreated in the current direc-
              tory; the -d option allows extraction in an arbitrary  directory
              (always  assuming one has permission to write to the directory).
              The option and directory may be concatenated without  any  white
              space  between  them,  but note that this may cause normal shell
              behavior to be suppressed.  In particular, ‘‘-d ~’’  (tilde)  is
              expanded  by  Unix  C  shells  into  the name of the user’s home
              directory, but ‘‘-d~’’ is  treated  as  a  literal  subdirectory
              ‘‘~’’ of the current directory.


OPTIONS

       unzipsfx  supports the following unzip(1L) options:  -c and -p (extract
       to standard output/screen), -f and  -u  (freshen  and  update  existing
       files  upon  extraction),  -t (test archive) and -z (print archive com-
       ment).  All normal listing options (-l, -v and -Z) have  been  removed,
       but  the  testing  option (-t) may be used as a ‘‘poor man’s’’ listing.
       Alternatively, those creating  self-extracting  archives  may  wish  to
       include a short listing in the zipfile comment.

       See unzip(1L) for a more complete description of these options.


MODIFIERS

       unzipsfx  currently supports all unzip(1L) modifiers:  -a (convert text
       files), -n (never overwrite),  -o  (overwrite  without  prompting),  -q
       (operate  quietly),  -C  (match  names case-insensitively), -L (convert
       uppercase-OS names to lowercase), -j (junk paths) and -V  (retain  ver-
       sion  numbers);  plus  the following operating-system specific options:
       -X (restore VMS owner/protection info), -s (convert spaces in filenames
       to  underscores  [DOS,  OS/2,  NT])  and -$ (restore volume label [DOS,
       OS/2, NT, Amiga]).

       (Support for regular ASCII text-conversion may  be  removed  in  future
       versions, since it is simple enough for the archive’s creator to ensure
       that text files have the appropriate format for the local  OS.   EBCDIC
       conversion  will  of  course continue to be supported since the zipfile
       format implies ASCII storage of text files.)

       See unzip(1L) for a more complete description of these modifiers.


ENVIRONMENT OPTIONS

       unzipsfx  uses  the  same  environment  variables  as  unzip(1L)  does,
       although this is likely to be an issue only for the person creating and
       testing the self-extracting archive.  See unzip(1L) for details.


DECRYPTION

       Decryption is supported exactly as in unzip(1L); that is, interactively
       with  a  non-echoing  prompt  for  the  password(s).  See unzip(1L) for
       details.  Once again, note that if the archive has no  encrypted  files
       there  is  no  reason to use a version of unzipsfx with decryption sup-
       port; that only adds to the size of the archive.


AUTORUN COMMAND

       When unzipsfx was compiled with  CHEAP_SFX_AUTORUN  defined,  a  simple
       ‘‘command  autorun’’ feature is supported. You may enter a command into
       the Zip archive comment, using the following format:

           $AUTORUN$>[command line string]

       When unzipsfxP recognizes the $AUTORUN$> token at the beginning  of
       the Zip archive comment, the remainder of the first line of the comment
       (until the first newline character) is passed as a shell command to the
       operating  system using the C rtl system function. Before executing
       the command, unzipsfxP displays the command on the console and  prompts
       the user for confirmation.  When the user has switched off prompting by
       specifying the -q option, autorun commands are never executed.

       In case the archive comment  contains  additonal  lines  of  text,  the
       remainder  of the archive comment following the first line is displayed
       normally, unless quiet  operation  was  requested  by  supplying  a  -q
       option.


EXAMPLES

       To create a self-extracting archive letters from a regular zipfile let-
       ters.zip and change the new  archive’s  permissions  to  be  world-exe-
       cutable under Unix:

           cat unzipsfx letters.zip > letters
           chmod 755 letters
           zip -A letters

       To  create  the  same archive under MS-DOS, OS/2 or NT (note the use of
       the /b [binary] option to the copy command):

           copy /b unzipsfx.exe+letters.zip letters.exe
           zip -A letters.exe

       Under VMS:

           copy unzipsfx.exe,letters.zip letters.exe
           letters == "$currentdisk:[currentdir]letters.exe"
           zip -A letters.exe

       (The VMS append command may also be used.  The second command  installs
       the  new  program as a ‘‘foreign command’’ capable of taking arguments.
       The third line assumes that Zip is already installed as a foreign  com-
       mand.)  Under AmigaDOS:

           MakeSFX letters letters.zip UnZipSFX

       (MakeSFX  is included with the UnZip source distribution and with Amiga
       binary distributions.  ‘‘zip -A’’ doesn’t work on Amiga self-extracting
       archives.)   To  test  (or  list)  the  newly  created  self-extracting
       archive:

           letters -t

       To test letters quietly, printing only  a  summary  message  indicating
       whether the archive is OK or not:

           letters -tqq

       To extract the complete contents into the current directory, recreating
       all files and subdirectories as necessary:

           letters

       To extract all *.txt files (in Unix quote the ‘*’):

           letters *.txt

       To extract everything except the *.txt files:

           letters -x *.txt

       To extract only the README file to standard output (the screen):

           letters -c README

       To print only the zipfile comment:

           letters -z


LIMITATIONS

       The principle and fundamental limitation of unzipsfx is that it is  not
       portable  across architectures or operating systems, and therefore nei-
       ther are the resulting archives.  For some architectures there is  lim-
       ited  portability,  however  (e.g., between some flavors of Intel-based
       Unix).

       Another problem with the current implementation  is  that  any  archive
       with  ‘‘junk’’  prepended  to  the beginning technically is no longer a
       zipfile (unless zip(1) is used to adjust the zipfile offsets  appropri-
       ately, as noted above).  unzip(1) takes note of the prepended bytes and
       ignores them since some file-transfer protocols, notably MacBinary, are
       also  known  to  prepend  junk.  But PKWARE’s archiver suite may not be
       able to deal with the modified archive unless  its  offsets  have  been
       adjusted.

       unzipsfx  has no knowledge of the user’s PATH, so in general an archive
       must either be in the current directory when it is invoked, or  else  a
       full or relative path must be given.  If a user attempts to extract the
       archive from a directory in  the  PATH  other  than  the  current  one,
       unzipsfx  will  print  a  warning to the effect, ‘‘can’t find myself.’’
       This is always true under Unix and may be true in some cases under  MS-
       DOS,  depending  on  the compiler used (Microsoft C fully qualifies the
       program name, but other compilers may not).  Under OS/2  and  NT  there
       are  operating-system  calls available that provide the full path name,
       so the archive may be invoked from anywhere in the  user’s  path.   The
       situation is not known for AmigaDOS, Atari TOS, MacOS, etc.

       As  noted  above,  a number of the normal unzip(1L) functions have been
       removed in order to make unzipsfx smaller:  usage and diagnostic  info,
       listing  functions  and  extraction  to  other directories.  Also, only
       stored and deflated files are  supported.   The  latter  limitation  is
       mainly relevant to those who create SFX archives, however.

       VMS  users  must know how to set up self-extracting archives as foreign
       commands in order to use any of unzipsfx’s options.  This is not neces-
       sary  for  simple  extraction,  but  the command to do so then becomes,
       e.g., ‘‘run letters’’ (to continue the examples given above).

       unzipsfx on the Amiga requires the use of a special  program,  MakeSFX,
       in  order to create working self-extracting archives; simple concatena-
       tion does not work.  (For  technically  oriented  users,  the  attached
       archive  is  defined  as a ‘‘debug hunk.’’)  There may be compatibility
       problems between the ROM levels of older Amigas and newer ones.

       All current bugs in unzip(1L) exist in unzipsfx as well.


DIAGNOSTICS

       unzipsfx’s exit status (error level) is identical to that of unzip(1L);
       see the corresponding man page.


SEE ALSO

       funzip(1L), unzip(1L), zip(1L), zipcloak(1L), zipgrep(1L), zipinfo(1L),
       zipnote(1L), zipsplit(1L)


URL

       The Info-ZIP home page is currently at
           http://www.info-zip.org/pub/infozip/
       or
           ftp://ftp.info-zip.org/pub/infozip/ .


AUTHORS

       Greg Roelofs was responsible for the basic modifications to UnZip  nec-
       essary  to create UnZipSFX.  See unzip(1L) for the current list of Zip-
       Bugs authors, or the file CONTRIBS in the UnZip source distribution for
       the full list of Info-ZIP contributors.



Info-ZIP                      22 May 2004 (v5.51)                 UNZIPSFX(1L)

Man(1) output converted with man2html