$13.$ What chmod command using numeric notation will give the owner: read, write, execute, the group: read and execute, and other users: read and execute for file$1?$

$14.$ What value is stored in the umask variable and retrieved by the umask command to give a file the following permissions?

$-$rw$-$rw$-$rw$-1$ rbass rbass $0$ Sep $1107$:$53$ file$1$

$15.$ If the umask value is $0000,$ what permissions will be give a new directory created with the mkdir command?

$16.$ Why do new files get different permissions than those of a new directory using the same value for the umask variable of $022?$

$17.$ In addition to regular permissions for files, what special permissions can be set?

$18.$ What effect does the SUID have on a directory? On a file? Give an example of a file command with SUID set.

$19.$ What effect does SGID have on a directory? On a file?

$20.$ What is the sticky bit?