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chmod / chown — permissions and ownership

cheat sheet · Linux https://lab.dimsanych.ru/en/wiki/chmod-chown/

Cheat sheet

chmod 644 file rw-r--r--
chmod 755 script rwxr-xr-x
chmod 600 secret owner only
chmod 2770 team-dir setgid: new files inherit the directory's group
chown user:group file owner and group
chown -R www-data:www-data /var/www/site recursive (typical for a web root)
chgrp devs file change only the group
umask current mask for new files

Options

Below are the main flags of chmod and chown; the full list is in man chmod/man chown.