Which Linux command is used to grant or revoke file permissions?

Which Linux command is used to grant or revoke file permissions?

• A. chmod
• B. chown
• C. sudo
• D. chgrp

Answer: (A)

In Linux, file permissions are managed with the chmod command, which lets you grant or revoke access for the owner, the group, and others. You can add permissions with +, remove them with -, or set exact permissions with =. For example, and you can see how it works: chmod u+r file grants the owner read access; chmod go-w report.txt revokes write access from the group and others; chmod a+x script.sh makes the file executable by everyone. Using numeric modes like 755 or 644 is another common way to set multiple bits at once. Other commands don’t adjust permission bits directly: chown changes who owns the file, chgrp changes its group, and sudo runs commands with elevated privileges.

In Linux, file permissions are managed with the chmod command, which lets you grant or revoke access for the owner, the group, and others. You can add permissions with +, remove them with -, or set exact permissions with =. For example, and you can see how it works: chmod u+r file grants the owner read access; chmod go-w report.txt revokes write access from the group and others; chmod a+x script.sh makes the file executable by everyone. Using numeric modes like 755 or 644 is another common way to set multiple bits at once. Other commands don’t adjust permission bits directly: chown changes who owns the file, chgrp changes its group, and sudo runs commands with elevated privileges.