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Cream of the Crop 20
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Cream of the Crop 20 (Terry Blount) (1996).iso
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1996-04-27
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ZIP(1L) ZIP(1L)
NAME
zip, zipcloak, zipnote, zipsplit - package and compress
(archive) files
SYNOPSIS
zip [-AcdDeEfFghjklLmoqrSTuvVwXyz@$] [-b path] [-n suf-
fixes] [-t mmddyy] [ zipfile [ file1 file2 ...]]
[-xi list]
zipcloak [-dhL] [-b path] zipfile
zipnote [-hwL] [-b path] zipfile
zipsplit [-hiLpst] [-n size] [-b path] zipfile
DESCRIPTION
zip is a compression and file packaging utility for Unix,
VMS, MSDOS, OS/2, Windows NT, Minix, Atari and Macintosh.
It is analogous to a combination of the UNIX commands
tar(1) and compress(1) and is compatible with PKZIP (Phil
Katz's ZIP for MSDOS systems).
A companion program (unzip(1L)), unpacks zip archives.
The zip and unzip(1L) programs can work with archives pro-
duced by PKZIP, and PKZIP and PKUNZIP can work with
archives produced by zip. zip version 2.1 is compatible
with PKZIP 2.04. Note that PKUNZIP 1.10 cannot extract
files produced by PKZIP 2.04 or zip 2.1. You must use
PKUNZIP 2.04g or unzip 5.0p1 (or later versions) to
extract them.
For a brief help on zip and unzip, run each without speci-
fying any parameters on the command line.
The program is useful for packaging a set of files for
distribution; for archiving files; and for saving disk
space by temporarily compressing unused files or directo-
ries.
The zip program puts one or more compressed files into a
single zip archive, along with information about the files
(name, path, date, time of last modification, protection,
and check information to verify file integrity). An
entire directory structure can be packed into a zip
archive with a single command. Compression ratios of 2:1
to 3:1 are common for text files. zip has one compression
method (deflation) and can also store files without com-
pression. zip automatically chooses the better of the two
for each file to be compressed.
When given the name of an existing zip archive, zip will
replace identically named entries in the zip archive or
add entries for new names. For example, if foo.zip exists
and contains foo/file1 and foo/file2, and the directory
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ZIP(1L) ZIP(1L)
foo contains the files foo/file1 and foo/file3, then:
zip -r foo foo
will replace foo/file1 in foo.zip and add foo/file3 to
foo.zip. After this, foo.zip contains foo/file1,
foo/file2, and foo/file3, with foo/file2 unchanged from
before.
If the file list is specified as -@, zip takes the list of
input files from standard input. Under UNIX, this option
can be used to powerful effect in conjunction with the
find(1) command. For example, to archive all the C source
files in the current directory and its subdirectories:
find . -name "*.[ch]" -print | zip source -@
(note that the pattern must be quoted to keep the shell
from expanding it). zip will also accept a single dash
("-") as the zip file name, in which case it will write
the zip file to standard output, allowing the output to be
piped to another program. For example:
zip -r - . | dd of=/dev/nrst0 obs=16k
would write the zip output directly to a tape with the
specified block size for the purpose of backing up the
current directory.
zip also accepts a single dash ("-") as the name of a file
to be compressed, in which case it will read the file from
standard input, allowing zip to take input from another
program. For example:
tar cf - . | zip backup -
would compress the output of the tar command for the pur-
pose of backing up the current directory. This generally
produces better compression than the previous example
using the -r option, because zip can take advantage of
redundancy between files. The backup can be restored using
the command
unzip -p backup | tar xf -
When no zip file name is given and stdout is not a termi-
nal, zip acts as a filter, compressing standard input to
standard output. For example,
tar cf - . | zip | dd of=/dev/nrst0 obs=16k
is equivalent to
tar cf - . | zip - - | dd of=/dev/nrst0 obs=16k
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ZIP(1L) ZIP(1L)
zip archives created in this manner can be extracted with
the program funzip which is provided in the unzip package,
or by gunzip which is provided in the gzip package. For
example:
dd if=/dev/nrst0 ibs=16k | funzip | tar xvf -
When changing an existing zip archive, zip will write a
temporary file with the new contents, and only replace the
old one when the process of creating the new version has
been completed without error.
If the name of the zip archive does not contain an exten-
sion, the extension .zip is added. If the name already
contains an extension other than .zip the existing exten-
sion is kept unchanged.
OPTIONS
-A Adjust self-extracting executable archive. A self-
extracting executable archive is created by
prepending the SFX stub to an existing archive. The
-A option tells zip to adjust the entry offsets
stored in the archive to take into account this
"preamble" data.
-b path
Use the specified path for the temporary zip
archive. For example:
zip -b /tmp stuff *
will put the temporary zip archive in the directory
/tmp, copying over stuff.zip to the current direc-
tory when done. This option is only useful when
updating an existing archive, and the file system
containing this old archive does not have enough
space to hold both old and new archive at the same
time.
-c Add one-line comments for each file. File opera-
tions (adding, updating) are done first, and the
user is then prompted for a one-line comment for
each file. Enter the comment followed by return,
or just return for no comment.
-d Remove (delete) entries from a zip archive. For
example:
zip -d foo foo/tom/junk foo/harry/\* \*.o
will remove the entry foo/tom/junk, all of the
files that start with foo/harry/, and all of the
files that end with .o (in any path). Note that
shell pathname expansion has been inhibited with
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ZIP(1L) ZIP(1L)
backslashes, so that zip can see the asterisks,
enabling zip to match on the contents of the zip
archive instead of the contents of the current
directory.
Under MSDOS, -d is case sensitive when it matches
names in the zip archive. This requires that file
names be entered in upper case if they were zipped
by PKZIP on an MSDOS sys