7zr - A file archiver with highest compression ratio
7zr [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), ZIP,
CAB, ARJ, GZIP, BZIP2, TAR, CPIO, RPM and DEB formats. Compression
ratio in the new 7z format is 30-50% better than ratio in ZIP format.
7zr is a stand-alone executable. 7zr handles less archive formats than
7z, but does not need any others. 7zr is a "light-version" of 7za that
only handles 7z archives.
x eXtract with full paths
-bd Disable percentage indicator
-l 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/DOCS/MANUAL/switches/method.htm for a list
7z format only : enables or disables archive header encryption
(Default : off)
Set Output directory
Recurse subdirectories (CAUTION: this flag does not do what you
think, avoid using it)
Create SFX archive
-si Read data from StdIn (eg: tar cf - directory | 7zr a -si
-so Write data to StdOut (eg: 7zr x -so directory.tar.7z | tar xf -)
-slt Sets technical mode for l (list) command
Set Working directory
-y Assume Yes on all queries
7-Zip returns the following exit codes:
0 Normal (no errors or warnings detected)
1 Warning (Non fatal error(s)). For example, some files
cannot be read during compressing. So they were not
2 Fatal error
7 Bad command line parameters
8 Not enough memory for operation
255 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 | 7zr a -si
- to restore your backup : 7zr 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 : 7zr a directory.7z directory
Do not use "-r" because this flag does not do what you think.
Do not use directory/* because of ".*" files (example : "directory/*"
does not match "directory/.profile")
7zr 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
-t7z 7z archive
-mx=9 level of compression = 9 (Ultra)
number of fast bytes for LZMA = 64
dictionary size = 32 megabytes
-ms=on solid archive = on
7zr a -sfx archive.exe dir1
add all files from directory "dir1" to SFX archive archive.exe
(Remark : SFX archive MUST end with ".exe")
7zr 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)
7z(1), 7za(1), bzip2(1), gzip(1), zip(1)
Written for Debian by Mohammed Adnene Trojette.