chmod 664 — What Does It Mean?
chmod 664 gives the owner and group read/write access (6/6) while others can only read (4), common for shared files.
How to use this tool
- Set owner, group, and other permissions (0–7).
- Add permission bits: 4 = read (r), 2 = write (w), 1 = execute (x).
- Copy the octal code and run: chmod 754 filename
chmod 664 allows both the owner and group to edit a file while others can only read it — calculate the details here.
Frequently asked questions
- What does chmod 755 mean?
- 755 means: owner has read+write+execute (7), group has read+execute (5), others have read+execute (5). Symbolic: rwxr-xr-x. Common for executables and directories.
- What is chmod 644?
- 644 means owner can read+write (6), group and others can only read (4). Symbolic: rw-r--r--. Standard for web files and config files.