Windows PowerShell command on Get-command unzipsfx

Manual Pages for UNIX Operating System command usage for man unzipsfx

Misc. Reference Manual Pages UNZIPSFX(1L)

NAME

unzipsfx - self-extracting stub for prepending to ZIP

SYNOPSIS

[-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 abil-

ity 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 particular 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 begin-

ning 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 limi-

tation 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 zip-

file. ARGUMENTS [file(s)] An optional list of archive members to be processed. Regular expressions (wildcards) similar to those in

Info-ZIP Last change: 28 November 2007 (v5.53) 1

Misc. Reference Manual Pages UNZIPSFX(1L) 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 `^') fol-

lows the left bracket, then the range of charac-

ters 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, par-

ticularly 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 subdirec-

tories. 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 follow-

ing 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 per-

mission 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

Info-ZIP Last change: 28 November 2007 (v5.53) 2

Misc. Reference Manual Pages UNZIPSFX(1L)

options (-l, -v and -Z) have been removed, but the testing

option (-t) may be used as a ``poor man's'' listing. Alter-

natively, 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 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 for-

mat 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

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 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 fol-

lowing format:

$AUTORUN$>[command line string]

Info-ZIP Last change: 28 November 2007 (v5.53) 3

Misc. Reference Manual Pages UNZIPSFX(1L)

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 charac-

ter) 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 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 com-

mand installs the new program as a ``foreign command'' capa-

ble 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:

Info-ZIP Last change: 28 November 2007 (v5.53) 4

Misc. Reference Manual Pages UNZIPSFX(1L)

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 provide the full path name, so the archive may be

Info-ZIP Last change: 28 November 2007 (v5.53) 5

Misc. Reference Manual Pages UNZIPSFX(1L) 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

archives; simple concatenation does not work. (For techni-

cally 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.

ATTRIBUTES

See attributes(5) for descriptions of the following attri-

butes:

Info-ZIP Last change: 28 November 2007 (v5.53) 6

Misc. Reference Manual Pages UNZIPSFX(1L)

_______________________________________

| ATTRIBUTE TYPE | ATTRIBUTE VALUE|

|____________________|__________________|_

| Availability | compress/unzip |

|____________________|__________________|_

| Interface Stability| External |

|____________________|_________________|

NOTES Source for unzip is available on http://opensolaris.org.

Info-ZIP Last change: 28 November 2007 (v5.53) 7

Manual Pages for UNIX Operating System command usage for man unzipsfx

NAME

unzipsfx - self-extracting stub for prepending to ZIP

SYNOPSIS

[-cfptuz[ajnoqsCLV$]]

DESCRIPTION

unzipsfx is a modified version of unzip(1L) designed to be

argument to be the zipfile(s) to be extracted, unzipsfx

Note that self-extracting archives made with unzipsfx are no

If unzipsfx is compiled with SFX_EXDIR defined, the follow-

unzipsfx supports the following unzip(1L) options: -c and

unzipsfx currently supports all unzip(1L) modifiers: -a

unzipsfx uses the same environment variables as unzip(1L)

version of unzipsfx with decryption support; that only adds

When unzipsfx was compiled with CHEAP_SFX_AUTORUN defined, a

When unzipsfx recognizes the ``$AUTORUN$>'' token at the

command, unzipsfxP displays the command on the console and

EXAMPLES

cat unzipsfx letters.zip > letters

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

copy unzipsfx.exe,letters.zip letters.exe

The principle and fundamental limitation of unzipsfx is that

unzipsfx has no knowledge of the user's PATH, so in general

in the PATH other than the current one, unzipsfx will print

have been removed in order to make unzipsfx smaller: usage

as foreign commands in order to use any of unzipsfx's

unzipsfx on the Amiga requires the use of a special program,

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

unzipsfx's exit status (error level) is identical to that of

SEE ALSO

ATTRIBUTES

| ATTRIBUTE TYPE | ATTRIBUTE VALUE|