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The URLs of the form `help://man/<section>/<page>` link to another help page inside the help application. All previous relative page links are replaced by this new form. This doesn't change any behavior but it looks much nicer :^) Note that man doesn't handle these new links, but the previous relative links didn't work either.
48 lines
1.8 KiB
Markdown
48 lines
1.8 KiB
Markdown
## Name
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chmod - change file mode
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## Synopsis
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```**sh
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$ chmod <octal-mode> <path...>
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$ chmod <mode> <path...>
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```
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## Description
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`chmod` changes mode of all files specified in `path` to `octal-mode` or using symbolic representation.
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The symbolic representation format is `[[ugoa][+-=][rwx...],...]`. Multiple symbolic can be given, separated by commas.
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The letters `[ugoa]` controls which users' access will be changes: `u` means file owner, `g` file owning group, `o` others, and `a` - all users. If no letter is given, `a` is assumed.
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The letters `[+-=]` controls which action will be taken: `+` sets the permission, `-` removes the permission, and `=` sets the mentioned permissions and unsets the other permissions.
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The letters `[rwx]` controls which permission will be changes: `r` is read, `w` is write and `x` is execute.
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A numeric mode is combination of 1 to 4 numbers. Omitted digits are assumed to be leading zeros. The first digit select the set user ID (4), set group ID (2) and restricted deletion / sticky (1) attributes. The second, third and fourth digit controls permissions of each user group: owner, owning group and others (not owner or owning group), respectively: read (4), write (2) and execute (1).
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## Examples
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```sh
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# Allow full access for owner, read-execute for group, and no access for others, of 'README.md':
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$ chmod 750 README.md
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# Change '/bin/su' to be set-uid, read-write-execute for owner, only execute for others:
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# chmod 4711 /bin/su
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# Add read access for others to all files in 'Source' directory:
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$ chmod o+r Source/*
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# Deny read and write access for non-owners, and allow full access for owners of 'script.sh':
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$ chmod o-rw,g-rw,u+rwx script.sh
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# Set group access to only read of 'script.sh':
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$ chmod g=r script.sh
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```
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## See also
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* [`chgrp`(1)](help://man/1/chgrp)
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* [`chown`(1)](help://man/1/chown)
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