57 lines
1.3 KiB
Markdown
57 lines
1.3 KiB
Markdown
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---
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tags: [permissions, Linux]
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created: Friday, April 11, 2025
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---
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# chown
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Change the owner of system files and directories.
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Basic syntax: `chown <owner:group> filename`.
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```sh
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# Change file owner
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chown user1 doc.txt
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# Change owner and group
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chown user1:developers document.txt
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# Change only the group
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chown :staff shared_folder/
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# Do so recursively for dirs
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chown -R www-data:www-data /var/www/
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```
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TODO: Partition into separate entry on groups:
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> When a user account in Linux is created the system also creates a group with
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> the same name as the user (known as the _primary group_ or _user private
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> group_).
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Because of the above, you will often change owndership to yourself with:
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```sh
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chown thomas:thomas some_dir
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```
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See groups:
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```sh
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groups
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# thomas realtime docker input wheel adb plugdev
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```
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When reassigning users and groups, it's safest to use the actual name. But each
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user/group also has a numeric representation, corresponding to UID:GID.
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The first regular, non-system user created on most Unix distributions is 1000
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but this isn't universal. Likewise his group will be 1000.
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See your UID/GID and the GIDs of the groups you're in:
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```
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$ id
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uid=1000(thomas) gid=1000(thomas) groups=1000(thomas),959(realtime),966(docker),994(input),998(wheel),1001(adb),1002(plugdev)
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```
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