Section: User Commands (1)
Updated: September 1 2006
7za [adeltux] [-] [SWITCH] <ARCHIVE_NAME> <ARGUMENTS>...
7-Zip is a file archiver with the highest compression ratio. The program supports 7z (that implements LZMA compression algorithm), LZMA2, XZ, ZIP, Zip64, CAB, RAR (if the non-free p7zip-rar package is installed), ARJ, GZIP, BZIP2, TAR, CPIO, RPM, ISO, most filesystem images and DEB formats. Compression ratio in the new 7z format is 30-50% better than ratio in ZIP format.
:7za is a stand-alone executable. 7za handles less archive formats than 7z.
- eXtract with full paths:
- Include archives:
- eXclude archives:
- Disable percentage indicator:
- Include filenames:
- don't store symlinks; store the files/directories they point to (CAUTION : the scanning stage can never end because of recursive symlinks like 'ln -s .. ldir'):
- Set Compression Method (see /usr/share/doc/p7zip-full/DOCS/MANUAL/switches/method.htm for a list of methods):
- 7z format only : enables or disables archive header encryption (Default : off):
- Set Output directory:
- Set Password:
- Recurse subdirectories (CAUTION: this flag does not do what you think, avoid using it):
- Create SFX archive:
- Read data from StdIn (eg: tar cf - directory | 7za a -si directory.tar.7z):
- Write data to StdOut (eg: % echo foo | 7z a dummy -tgzip -si -so > /dev/null):
- Sets technical mode for l (list) command:
- Type of archive (7z, zip, gzip, bzip2 or tar. 7z format is default):
- Create volumes:
- Update options:
- Set Working directory:
- Exclude filenames:
- Assume Yes on all queries:
7-Zip returns the following exit codes:
- Normal (no errors or warnings detected):
- Warning (Non fatal error(s)). For example, some files cannot be read during compressing. So they were not compressed:
- Fatal error:
- Bad command line parameters:
- Not enough memory for operation:
- User stopped the process with control-C (or similar):
Backup and limitations
DO NOT USE the 7-zip format for backup purpose on Linux/Unix because :
- 7-zip does not store the owner/group of the file.
On Linux/Unix, in order to backup directories you must use tar :
- to backup a directory : tar cf - directory | 7za a -si directory.tar.7z
- to restore your backup : 7za x -so directory.tar.7z | tar xf -
If you want to send files and directories (not the owner of file) to others Unix/MacOS/Windows users, you can use the 7-zip format.
example : 7za a directory.7z directory
Do not use "-r" because this flag does not do what you think.
- 7za a -t7z -m0=lzma -mx=9 -mfb=64 -md=32m -ms=on archive.7z dir1
- adds all files from directory "dir1" to archive archive.7z using "ultra settings":
- 7z archive:
- lzma method:
- level of compression = 9 (Ultra):
- number of fast bytes for LZMA = 64:
- dictionary size = 32 megabytes:
- solid archive = on:
- 7za a -sfx archive.exe dir1
- add all files from directory "dir1" to SFX archive archive.exe (Remark : SFX archive MUST end with ".exe"):
- 7za a -mhe=on -pmy_password archive.7z a_directory
- add all files from directory "a_directory" to the archive "archive.7z" (with data and header archive encryption on):
:Written for Debian by Mohammed Adnene Trojette.