chmod - evanmoran/quick GitHub Wiki
Change access control of the file or directory.
Readable by anyone. Writable only by user
chmod 644 <file> # User:r/w, Group: r, Other: r
Readable and executable by anyone. Writable only by user.
chmod 755 <file> # User: r/w/x, Group: r/x, Other: r/x
SSH File Permission: Only the user can read and write
chmod 600 <file> # User: r/w
SSH Directory Permission. Only the user can read/write/execute
chmod 700 <directory> # User: r/w/x
Add r/x to directories recursively. cd does not work on directories unless they have r/x, so this
is used to quickly make a directory structure navigable.
chmod -R u+rX <directory> # Recursively give: User: r/x
Numbers
1 # execute
2 # write
3 # execute + write
4 # read (common)
5 # execute + read (common)
6 # write + read
7 # all (common)
Types
u # User
g # Group
o # Other
chmod u+rw <file> # User read and write (chmod
chmod u=rw,go= <file> # For a happy OpenSSH key! (chmod 600)