Visual EditorBit ExplanationsCommon Patterns
| Read | Write | Execute | Value | |
|---|---|---|---|---|
| Owner | 7 | |||
| Group | 5 | |||
| Other | 5 |
Numeric
755
Symbolic
rwxr-xr-x
chmod Command
chmod 755 fileCommon Permission Patterns
How Unix Permissions Work
Read (r = 4): View file contents or list directory entries.
Write (w = 2): Modify file contents or add/delete files in a directory.
Execute (x = 1): Run as a program or access files within a directory.
Each permission group (Owner, Group, Other) gets a digit 0-7, calculated by adding the bit values of enabled permissions. For example: rwx = 4+2+1 = 7, r-x = 4+1 = 5.
FAQ
What is the difference between this and chmod-calculator?
This tool adds detailed explanations for each permission bit, hover-to-learn functionality, and a reference of common patterns with use cases.
Why should I avoid 777?
Permission 777 gives read, write, and execute access to everyone on the system, which is a major security risk.
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