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       unzipsfx	- self-extracting stub for prepending to ZIP archives

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

       unzipsfx	is a modified version of unzip(1L) designed to be prepended to
       existing	 ZIP  archives in order	to form	self-extracting	archives.  In-
       stead 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	 capa-
       bilities	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  di-
       rectory	other  than  the current one can be selected as	a compile-time
       option, which is	now enabled by default	since  UnZipSFX	 version  5.5.
       Similarly,  decryption is supported as a	compile-time option but	should
       be avoided unless the attached archive contains encrypted files.	Start-
       ing  with  release 5.5, another compile-time option adds	a simple ``run
       command after extraction'' feature.  This feature is  currently	incom-
       patible 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 ex-
       ecutable	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.

	      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 ex-
	      tract  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 di-
	      rectory, but ``-d~'' is treated as a literal subdirectory	 ``~''
	      of the current directory.

       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  in-
       clude a short listing in	the zipfile comment.

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

       unzipsfx	 currently supports all	unzip(1L) modifiers:  -a (convert text
       files), -n (never overwrite), -o	(overwrite without prompting), -q (op-
       erate quietly), -C (match names case-insensitively), -L (convert	upper-
       case-OS names to	lowercase), -j (junk paths)  and  -V  (retain  version
       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.

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

       Decryption is supported exactly as in unzip(1L);	that is, interactively
       with  a	non-echoing prompt for the password(s).	 See unzip(1L) for de-
       tails.  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.

       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 unzipsfx 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, unzipsfx 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 additional lines of	text, the  re-
       mainder	of  the	 archive comment following the first line is displayed
       normally, unless	quiet operation	was requested by supplying  a  -q  op-

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

       cat unzipsfx	> 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	letters.exe
       zip -A letters.exe

       Under VMS:

       copy unzipsfx.exe, 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 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 ar-

       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:


       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

       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

       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 ad-

       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,  un-
       zipsfx 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	 oper-
       ating-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  ar-
       chive  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.

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

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

       The Info-ZIP home page is currently at
       or .

       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		     20	April 2009 (v6.0)		  UNZIPSFX(1L)


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