#COMPRESS DATA AND RECOMPRESS IT TO ITS ORIGINAL STATE ZIP#

Zip archives created in this manner can be extracted with the program funzip that is provided in the unzip package, or by gunzip that is provided in the gzip package (but some installations of gunzip may not support this if zip used the Zip64 extensions).

#COMPRESS DATA AND RECOMPRESS IT TO ITS ORIGINAL STATE ZIP FILE#

When no zip file name is given and stdout is not a terminal, zip acts as a filter, compressing standard input to standard output. The backup can be restored using the command: unzip -p backup | tar xf. This generally produces better compression than the previous example using the -r option because zip can take advantage of redundancy between files. would compress the output of the tar command 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. would write the zip output directly to a tape with the specified block size for the purpose of backing up the current directory. 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. (note that the pattern must be quoted to keep the shell from expanding it).

#COMPRESS DATA AND RECOMPRESS IT TO ITS ORIGINAL STATE ARCHIVE#

For example, to archive all the C source files in the current directory and its subdirectories: find. Under Unix, this option can be used to powerful effect in conjunction with the find command. will store the files listed, one per line on standard input, in the archive foo.zip. If a file list is specified as, zip takes the list of input files from standard input instead of from the command line. where foo/file1 is replaced and foo/file3 is new. So if before the zip command is executed foo.zip has: foo/file1 After this, foo.zip contains foo/file1, foo/file2, and foo/file3, with foo/file2 unchanged from before. will replace foo/file1 in foo.zip and add foo/file3 to foo.zip. For example, if foo.zip exists and contains foo/file1 and foo/file2, and the directory foo contains the files foo/file1 and foo/file3, then: zip -r foo.zip foo When given the name of an existing zip archive, zip will replace identically named entries in the zip archive (matching the relative names as stored in the archive) or add entries for new names. where archive is a new or existing zip archive and inpath is a directory or file path optionally including wildcards. The basic command format is: zip options archive inpath inpath. 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. (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). Zip 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. Zip supports macOS X, and on that OS, most Unix features are the same. 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).

It is analogous to a combination of the Unix commands tar and compress, and it is compatible with PKZIP.Ī separate companion program, unzip, unpacks and uncompresses zip archives.

#COMPRESS DATA AND RECOMPRESS IT TO ITS ORIGINAL STATE WINDOWS#

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.

Compress data and recompress it to its original state