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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. Similarly, 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 particular Unix system, for example,
will only self-extract under the same flavor of Unix. Regular unzip may still be used to extract the embedded 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 direc-
tory 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 interpreted or modified by the operating system, particu-
larly under Unix and VMS.)
[-x xfile(s)]
An optional list of archive members to be excluded from processing. 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 directory; 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 comment). 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 with-
out prompting), -q (operate quietly), -C (match names case-insensitively), -L (convert uppercase-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 con-
tinue 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 per-
son 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 ver-
sion of unzipsfx with decryption support; 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 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 exe-
cuted.
In case the archive comment contains additional 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 letters.zip and change the new archive's permissions
to be world-executable 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 command.) 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 sys-
tems, and therefore neither are the resulting archives. For some architectures there is limited 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 appropriately, 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 pro-
vide 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 necessary 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 ar-
chives; simple concatenation 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 necessary 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)
