12/30/2023 0 Comments Zip winWhere archive is a new or existing zip archive and inpath is a directory or file path optionally including wildcards. When bzip2 compression is selected, it replaces deflation as the default method.) zip automatically chooses the better of the two (deflation or store or, if bzip2 is selected, bzip2 or store) for each file to be compressed.Ĭommand format. (If bzip2 support is added, zip can also compress using bzip2 compression, but such entries require a reasonably modern unzip to decompress. zip has one compression method (deflation) and can also store files without compression. Compression ratios of 2:1 to 3:1 are common for text files. An entire directory structure can be packed into a zip archive with a single command. 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). 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 directories. In addition, streamed archives, entries encrypted with standard encryption, or split archives created with the pause option may not be compatible with PKZIP as data descriptors are used and PKZIP at the time of this writing does not support data descriptors (but recent changes in the PKWare published zip standard now include some support for the data descriptor format zip uses).įor a brief help on zip and unzip, run each without specifying any parameters on the command line. You must use a PKZIP 4.5 compatible unzip, such as unzip 6.0 or later, to extract files using the Zip64 extensions. Zip64 is also used for archives streamed from standard input as the size of such archives are not known in advance, but the option -fz- can be used to force zip to create PKZIP 2 compatible archives (as long as Zip64 extensions are not needed). zip automatically uses the Zip64 extensions when files larger than 4 GB are added to an archive, an archive containing Zip64 entries is updated (if the resulting archive still needs Zip64), the size of the archive will exceed 4 GB, or when the number of entries in the archive will exceed about 64K. See the EXAMPLES section at the bottom of this page for examples of some typical uses of zip. You must use PKUNZIP 2.04g or unzip 5.0p1 (or later versions) to extract them. Note that PKUNZIP 1.10 cannot extract files produced by PKZIP 2.04 or zip 3.0. zip version 3.0 is compatible with PKZIP 2.04 and also supports the Zip64 extensions of PKZIP 4.5 which allow archives as well as files to exceed the previous 2 GB limit (4 GB in some cases). The zip and unzip programs can work with archives produced by PKZIP (supporting most PKZIP features up to PKZIP version 4.6), and PKZIP and PKUNZIP can work with archives produced by zip (with some exceptions, notably streamed archives, but recent changes in the zip file standard may facilitate better compatibility). It is analogous to a combination of the Unix commands tar and compress and is compatible with PKZIP (Phil Katz's ZIP for MSDOS systems).Ī companion program ( unzip) unpacks zip archives. Zip is a compression and file packaging utility for Unix, VMS, MSDOS, OS/2, Windows 9x/NT/XP, Minix, Atari, Macintosh, Amiga, and Acorn RISC OS. Some old command lines that depend on command line inconsistencies may no longer work. Note: Command line processing in zip has been changed to support long options and handle all options and arguments more consistently.
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