7ZIP manual & documentation

On this site:
7zC.txt
7zFormat.txt
License.txt
MANUAL/commands/add.htm
MANUAL/commands/bench.htm
MANUAL/commands/delete.htm
MANUAL/commands/extract.htm
MANUAL/commands/extract_full.htm
MANUAL/commands/index.htm
MANUAL/commands/list.htm
MANUAL/commands/style.css
MANUAL/commands/test.htm
MANUAL/commands/update.htm
MANUAL/exit_codes.htm
MANUAL/index.htm
MANUAL/style.css
MANUAL/switches/ar_exclude.htm
MANUAL/switches/ar_include.htm
MANUAL/switches/ar_no.htm
MANUAL/switches/charset.htm
MANUAL/switches/exclude.htm
MANUAL/switches/include.htm
MANUAL/switches/index.htm
MANUAL/switches/list_tech.htm
MANUAL/switches/method.htm
MANUAL/switches/output_dir.htm
MANUAL/switches/overwrite.htm
MANUAL/switches/password.htm
MANUAL/switches/recurse.htm
MANUAL/switches/sfx.htm
MANUAL/switches/ssc.htm
MANUAL/switches/stdin.htm
MANUAL/switches/stdout.htm
MANUAL/switches/stop_switch.htm
MANUAL/switches/style.css
MANUAL/switches/type.htm
MANUAL/switches/update.htm
MANUAL/switches/volume.htm
MANUAL/switches/working_dir.htm
MANUAL/switches/yes.htm
MANUAL/syntax.htm
Methods.txt
copying.txt
history.txt
lzma.txt
readme.txt
unRarLicense.txt

u (Update) command

Update older files in the archive and add files that are not already in the archive.

Note: The current version of 7-Zip cannot change an archive which was created with the solid option switched on. To update a .7z archive you must create and update that archive only in non-solid mode (-ms=off switch).

Example

7z u archive.zip *.doc

updates *.doc files to archive archive.zip.

Switches that can be used with this command

-i (Include)
-m (Method)
-p (Set Password)
-r (Recurse)
-sfx (create SFX)
-si (use StdIn)
-so (use StdOut)
-t (Type of archive)
-u (Update)
-w (Working Dir)
-x (Exclude)

See also

Commands: a (Add), d (Delete),

Switches: -u (Update)

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