umask

Question 1

umask

Answer 1

umask() sets the calling process’s file mode creation mask (umask) to mask & 0777 (i.e., only the file permission bits of mask are used), and returns the previous value of the mask.

Question 2

umask

• p
• S

Answer 2

• p, If MODE is omitted, output in a form that may be reused as input.
• S, Makes the output symbolic; otherwise an octal number is output.

Question 3

umask [PERMISSIONS]

777 = No permissions

000 = All permissions

666 umask = 111 chmod

555 = 222

444 = 333

333 =444

Answer 3

umask 027 = chmod 750

umask g-x

This will remove a permission.