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March 6th, 2016


7zr file archiver with high compression ratio


7zr - A file archiver with high compression ratio format


7zr <command> [<switches>... ] <archive_name> [<file_names>... ] [<@listfiles>... ]


7-Zip is a file archiver supporting 7z (that implements LZMA compression algorithm featuring very high compression ratio), 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.
7zr is a stand-alone executable. 7zr is a "light-version" of 7za(1). 7zr handles password-less archives in the 7z, LZMA2, and XZ formats only.


a Add files to archive
b Benchmark
d Delete files from archive
e Extract files from archive (without using directory names)
h Calculate hash values for files
i Show information about supported formats
l List contents of archive
rn Rename files in archive
t Test integrity of archive
u Update files to archive
x eXtract files with full paths


-- Stop switches parsing
Include archives
Exclude archives
Set Overwrite mode
-an Disable archive_name field
Set output log level
-bd Disable progress indicator
Set output stream for output/error/progress line
-bt Show execution time statistics
Include filenames
Set Compression Method (see /usr/share/doc/p7zip/DOC/MANUAL/cmdline/switches/method.htm from the p7zip-full package for a list of methods)
Set Output directory
-r[-|0] Recurse subdirectories (CAUTION: this flag does not do what you think, avoid using it)
Set archive name mode
Set charset for for console input/output
Set charset for list files
Set hash function for x, e, h commands
-sdel Delete files after compression
Send archive by email
Create SFX archive
Read data from stdin (e.g. tar cf - directory | 7zr a -si directory.tar.7z)
-slp Set Large Pages mode
-slt Show technical information for l (List) command
-snh Store hard links as links
-snl Store symbolic links as links
-sni Store NT security information
-sns[-] Store NTFS alternate streams
Create SFX archive
-so Write data to stdout (e.g. 7zr x -so directory.tar.7z | tar xf -)
-spd Disable wildcard matching for file names
-spe Eliminate duplication of root folder for extract command
-spf Use fully qualified file paths
-ssc[-] Set sensitive case mode
-ssw Compress shared files
-stl Set archive timestamp from the most recently modified file
Set CPU thread affinity mask (hexadecimal number)
Exclude archive type
Set type of archive
Update options
Create volumes
Set working directory. Empty path means a temporary directory
Exclude filenames
-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 compressed
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 directory.tar.7z
- 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 "ultra settings"
-t7z 7z archive
lzma method
-mx=9 level of compression = 9 (Ultra)
-mfb=64 number of fast bytes for LZMA = 64
-md=32m 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")

HTML Documentation

/usr/share/doc/p7zip/DOC/MANUAL/start.htm (avabilable when the p7zip-full package is installed)


Written for Debian by Mohammed Adnene Trojette. Updated by Robert Luberda.


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