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280 lines
14 KiB
Plaintext
280 lines
14 KiB
Plaintext
UNZIPSFX(1L) UNZIPSFX(1L)
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NAME
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unzipsfx - self-extracting stub for prepending to ZIP archives
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SYNOPSIS
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<name of unzipsfx+archive combo> [-cfptuz[ajnoqsCLV$]] [file(s) ...
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[-x xfile(s) ...]]
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DESCRIPTION
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unzipsfx is a modified version of unzip(1L) designed to be prepended to
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existing ZIP archives in order to form self-extracting archives.
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Instead of taking its first non-flag argument to be the zipfile(s) to
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be extracted, unzipsfx seeks itself under the name by which it was
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invoked and tests or extracts the contents of the appended archive.
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Because the executable stub adds bulk to the archive (the whole purpose
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of which is to be as small as possible), a number of the less-vital
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capabilities in regular unzip have been removed. Among these are the
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usage (or help) screen, the listing and diagnostic functions (-l and
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-v), the ability to decompress older compression formats (the
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``reduce,'' ``shrink'' and ``implode'' methods). The ability to
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extract to a directory other than the current one can be selected as a
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compile-time option, which is now enabled by default since UnZipSFX
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version 5.5. Similarly, decryption is supported as a compile-time
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option but should be avoided unless the attached archive contains
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encrypted files. Starting with release 5.5, another compile-time option
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adds a simple ``run command after extraction'' feature. This feature
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is currently incompatible with the ``extract to different directory''
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feature and remains disabled by default.
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Note that self-extracting archives made with unzipsfx are no more (or
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less) portable across different operating systems than is the unzip
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executable itself. In general a self-extracting archive made on a par-
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ticular Unix system, for example, will only self-extract under the same
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flavor of Unix. Regular unzip may still be used to extract the embed-
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ded archive as with any normal zipfile, although it will generate a
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harmless warning about extra bytes at the beginning of the zipfile.
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Despite this, however, the self-extracting archive is technically not a
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valid ZIP archive, and PKUNZIP may be unable to test or extract it.
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This limitation is due to the simplistic manner in which the archive is
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created; the internal directory structure is not updated to reflect the
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extra bytes prepended to the original zipfile.
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ARGUMENTS
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[file(s)]
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An optional list of archive members to be processed. Regular
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expressions (wildcards) similar to those in Unix egrep(1) may be
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used to match multiple members. These wildcards may contain:
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* matches a sequence of 0 or more characters
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? matches exactly 1 character
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[...] matches any single character found inside the brackets;
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ranges are specified by a beginning character, a hyphen,
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and an ending character. If an exclamation point or a
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caret (`!' or `^') follows the left bracket, then the
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range of characters within the brackets is complemented
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(that is, anything except the characters inside the
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brackets is considered a match).
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(Be sure to quote any character that might otherwise be inter-
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preted or modified by the operating system, particularly under
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Unix and VMS.)
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[-x xfile(s)]
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An optional list of archive members to be excluded from process-
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ing. Since wildcard characters match directory separators
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(`/'), this option may be used to exclude any files that are in
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subdirectories. For example, ``foosfx *.[ch] -x */*'' would
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extract all C source files in the main directory, but none in
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any subdirectories. Without the -x option, all C source files
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in all directories within the zipfile would be extracted.
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If unzipsfx is compiled with SFX_EXDIR defined, the following option is
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also enabled:
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[-d exdir]
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An optional directory to which to extract files. By default,
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all files and subdirectories are recreated in the current direc-
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tory; the -d option allows extraction in an arbitrary directory
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(always assuming one has permission to write to the directory).
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The option and directory may be concatenated without any white
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space between them, but note that this may cause normal shell
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behavior to be suppressed. In particular, ``-d ~'' (tilde) is
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expanded by Unix C shells into the name of the user's home
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directory, but ``-d~'' is treated as a literal subdirectory
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``~'' of the current directory.
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OPTIONS
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unzipsfx supports the following unzip(1L) options: -c and -p (extract
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to standard output/screen), -f and -u (freshen and update existing
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files upon extraction), -t (test archive) and -z (print archive com-
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ment). All normal listing options (-l, -v and -Z) have been removed,
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but the testing option (-t) may be used as a ``poor man's'' listing.
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Alternatively, those creating self-extracting archives may wish to
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include a short listing in the zipfile comment.
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See unzip(1L) for a more complete description of these options.
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MODIFIERS
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unzipsfx currently supports all unzip(1L) modifiers: -a (convert text
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files), -n (never overwrite), -o (overwrite without prompting), -q
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(operate quietly), -C (match names case-insensitively), -L (convert
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uppercase-OS names to lowercase), -j (junk paths) and -V (retain ver-
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sion numbers); plus the following operating-system specific options:
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-X (restore VMS owner/protection info), -s (convert spaces in filenames
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to underscores [DOS, OS/2, NT]) and -$ (restore volume label [DOS,
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OS/2, NT, Amiga]).
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(Support for regular ASCII text-conversion may be removed in future
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versions, since it is simple enough for the archive's creator to ensure
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that text files have the appropriate format for the local OS. EBCDIC
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conversion will of course continue to be supported since the zipfile
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format implies ASCII storage of text files.)
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See unzip(1L) for a more complete description of these modifiers.
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ENVIRONMENT OPTIONS
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unzipsfx uses the same environment variables as unzip(1L) does,
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although this is likely to be an issue only for the person creating and
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testing the self-extracting archive. See unzip(1L) for details.
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DECRYPTION
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Decryption is supported exactly as in unzip(1L); that is, interactively
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with a non-echoing prompt for the password(s). See unzip(1L) for
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details. Once again, note that if the archive has no encrypted files
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there is no reason to use a version of unzipsfx with decryption sup-
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port; that only adds to the size of the archive.
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AUTORUN COMMAND
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When unzipsfx was compiled with CHEAP_SFX_AUTORUN defined, a simple
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``command autorun'' feature is supported. You may enter a command into
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the Zip archive comment, using the following format:
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$AUTORUN$>[command line string]
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When unzipsfx recognizes the ``$AUTORUN$>'' token at the beginning of
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the Zip archive comment, the remainder of the first line of the comment
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(until the first newline character) is passed as a shell command to the
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operating system using the C rtl ``system'' function. Before executing
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the command, unzipsfx displays the command on the console and prompts
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the user for confirmation. When the user has switched off prompting by
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specifying the -q option, autorun commands are never executed.
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In case the archive comment contains additional lines of text, the
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remainder of the archive comment following the first line is displayed
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normally, unless quiet operation was requested by supplying a -q
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option.
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EXAMPLES
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To create a self-extracting archive letters from a regular zipfile let-
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ters.zip and change the new archive's permissions to be world-exe-
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cutable under Unix:
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cat unzipsfx letters.zip > letters
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chmod 755 letters
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zip -A letters
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To create the same archive under MS-DOS, OS/2 or NT (note the use of
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the /b [binary] option to the copy command):
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copy /b unzipsfx.exe+letters.zip letters.exe
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zip -A letters.exe
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Under VMS:
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copy unzipsfx.exe,letters.zip letters.exe
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letters == "$currentdisk:[currentdir]letters.exe"
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zip -A letters.exe
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(The VMS append command may also be used. The second command installs
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the new program as a ``foreign command'' capable of taking arguments.
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The third line assumes that Zip is already installed as a foreign com-
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mand.) Under AmigaDOS:
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MakeSFX letters letters.zip UnZipSFX
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(MakeSFX is included with the UnZip source distribution and with Amiga
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binary distributions. ``zip -A'' doesn't work on Amiga self-extracting
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archives.) To test (or list) the newly created self-extracting
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archive:
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letters -t
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To test letters quietly, printing only a summary message indicating
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whether the archive is OK or not:
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letters -tqq
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To extract the complete contents into the current directory, recreating
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all files and subdirectories as necessary:
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letters
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To extract all *.txt files (in Unix quote the `*'):
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letters *.txt
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To extract everything except the *.txt files:
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letters -x *.txt
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To extract only the README file to standard output (the screen):
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letters -c README
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To print only the zipfile comment:
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letters -z
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LIMITATIONS
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The principle and fundamental limitation of unzipsfx is that it is not
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portable across architectures or operating systems, and therefore nei-
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ther are the resulting archives. For some architectures there is lim-
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ited portability, however (e.g., between some flavors of Intel-based
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Unix).
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Another problem with the current implementation is that any archive
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with ``junk'' prepended to the beginning technically is no longer a
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zipfile (unless zip(1) is used to adjust the zipfile offsets appropri-
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ately, as noted above). unzip(1) takes note of the prepended bytes and
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ignores them since some file-transfer protocols, notably MacBinary, are
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also known to prepend junk. But PKWARE's archiver suite may not be
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able to deal with the modified archive unless its offsets have been
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adjusted.
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unzipsfx has no knowledge of the user's PATH, so in general an archive
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must either be in the current directory when it is invoked, or else a
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full or relative path must be given. If a user attempts to extract the
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archive from a directory in the PATH other than the current one,
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unzipsfx will print a warning to the effect, ``can't find myself.''
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This is always true under Unix and may be true in some cases under MS-
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DOS, depending on the compiler used (Microsoft C fully qualifies the
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program name, but other compilers may not). Under OS/2 and NT there
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are operating-system calls available that provide the full path name,
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so the archive may be invoked from anywhere in the user's path. The
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situation is not known for AmigaDOS, Atari TOS, MacOS, etc.
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As noted above, a number of the normal unzip(1L) functions have been
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removed in order to make unzipsfx smaller: usage and diagnostic info,
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listing functions and extraction to other directories. Also, only
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stored and deflated files are supported. The latter limitation is
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mainly relevant to those who create SFX archives, however.
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VMS users must know how to set up self-extracting archives as foreign
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commands in order to use any of unzipsfx's options. This is not neces-
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sary for simple extraction, but the command to do so then becomes,
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e.g., ``run letters'' (to continue the examples given above).
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unzipsfx on the Amiga requires the use of a special program, MakeSFX,
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in order to create working self-extracting archives; simple concatena-
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tion does not work. (For technically oriented users, the attached
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archive is defined as a ``debug hunk.'') There may be compatibility
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problems between the ROM levels of older Amigas and newer ones.
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All current bugs in unzip(1L) exist in unzipsfx as well.
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DIAGNOSTICS
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unzipsfx's exit status (error level) is identical to that of unzip(1L);
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see the corresponding man page.
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SEE ALSO
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funzip(1L), unzip(1L), zip(1L), zipcloak(1L), zipgrep(1L), zipinfo(1L),
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zipnote(1L), zipsplit(1L)
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URL
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The Info-ZIP home page is currently at
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http://www.info-zip.org/pub/infozip/
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or
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ftp://ftp.info-zip.org/pub/infozip/ .
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AUTHORS
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Greg Roelofs was responsible for the basic modifications to UnZip nec-
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essary to create UnZipSFX. See unzip(1L) for the current list of Zip-
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Bugs authors, or the file CONTRIBS in the UnZip source distribution for
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the full list of Info-ZIP contributors.
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Info-ZIP 20 April 2009 (v6.0) UNZIPSFX(1L)
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