File Permissions

To change a files mode use: $ chmod 777 file.txt

String	Octal	Description
rwxrwxrwx	777	Read, Write, Execute for all users.
rwxr-xr-x	755	Read and Execute for all users. Owner has write permission.
rwxr-x---	750	Read and Execute for owner and group. Owner has write permission. Users not in the group can not access the file.
rwx------	700	Read, Write, and Execute for the owner only.
rw-rw-rw	666	Read and Write for all users. Nobody can execute.
rw-rw-r--	664	Read and Write for the owner and group. Read-Only for everyone else.
rw-rw----	644	Read and Write for owner. Read-Only for everyone else.
rw-r-----	640	Read and write for owner. Read-Only for group. No permission for others.
rw-------	600	Read and write for owner. No permission for others.
r--------	400	Read for owner. No permission for anyone else.