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7za - Online in the Cloud

Run 7za in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command 7za that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



7za - A file archiver with highest compression ratio


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.


a Add

d Delete

e Extract

l List

t Test

u Update

x eXtract with full paths


Include archives

eXclude archives

-bd Disable percentage indicator

Include filenames

-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-
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

Create SFX archive

-si Read data from StdIn (eg: tar cf - directory | 7za a -si directory.tar.7z)

-so Write data to StdOut (eg: % echo foo | 7z a dummy -tgzip -si -so > /dev/null)

-slt 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

-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 | 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.

Do not use directory/* because of ".*" files (example : "directory/*" does not match


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"

-t7z 7z archive

lzma method

-mx=9 level of compression = 9 (Ultra)

number of fast bytes for LZMA = 64

dictionary size = 32 megabytes

-ms=on 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)

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