Chmod Calculator
Calculate Unix file permission modes with a visual checkboxes UI
| Read (4) | Write (2) | Execute (1) | Octal | |
|---|---|---|---|---|
| Owner | 6 | |||
| Group | 4 | |||
| Others | 4 |
Octal value
Symbolic notation
rw-r--r--
chmod command
chmod 644 filenameCommon Permissions
Unix file permissions are represented as three sets of three bits: read (r=4), write (w=2), and execute (x=1) for owner, group, and others. The octal value is the sum of the active bits in each set. Common values: 755 gives the owner full permissions while group and others can only read and execute (typical for executables and directories); 644 gives the owner read/write and others read-only (typical for regular files); 600 is private to the owner only (used for SSH keys).
Frequently Asked Questions
- chmod (change mode) is a Unix command that sets file or directory permission bits. Permissions control read (r), write (w), and execute (x) access for owner, group, and others.
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