chmod 640 (rw-r-----)

Owner: read, write · Group: read · Others: no access

640numeric

rw-r-----symbolic

6 · 4 · 0owner · group · others

Commands

chmod 640 filename chmod u=rw,g=r,o= filename chmod -R 640 folder/ # apply to a folder and everything in it

Change any permission with the chmod calculator.

What chmod 640 means

Who	Digit	Letters	Can
Owner (user)	6	`rw-`	read, write
Group	4	`r--`	read
Others	0	`---`	no access

Each digit is the sum of read (4), write (2) and execute (1).

Config files readable by a service’s group but not by other users.

chmod 640 sets the permissions to rw-r-----: the owner can read, write, the group can read and others can no access.

Config files readable by a service’s group but not by other users.

640 is rw-r----- (shown by ls -l as -rw-r----- for a file or drw-r----- for a folder). The symbolic chmod command is chmod u=rw,g=r,o= file.