Modify the adduser scripts to do the following. a. Use gawk to extract all the user identification numbers (UIDs) out of the mypasswd file into a file called currentuid. b. Use sed to remove all the system UID numbers, meaning all the one- , two-, and three-digit UIDs. You might want to put the remaining UIDs in a file named currentuid2. c. Use sed to remove the nobody (60001), noaccess (60002), and nobody4 (65534) UIDs. You might want to put the remaining UIDs in a file named currentuid3. Hint: a) 3rd Colum UID at /etc/passwd mypasswd --------- root:x:0:1:Super-User:/:/sbin/sh daemon:x:1:1::/: bin:x:2:2::/usr/bin: sys:x:3:3::/: adm:x:4:4:Admin:/var/adm: lp:x:71:8:Line Printer Admin:/usr/spool/lp: uucp:x:5:5:uucp Admin:/usr/lib/uucp: nuucp:x:9:9:uucp Admin:/var/spool/uucppublic:/usr/lib/uucp/uucico listen:x:37:4:Network Admin:/usr/net/nls: nobody:x:60001:60001:Nobody:/: noaccess:x:60002:60002:No Access User:/: nobody4:x:65534:65534:SunOS 4.x Nobody:/: user1:x:1001:10::/export/home/user1:/bin/sh user2:x:1002:10::/export/home/user2:/bin/ksh adduser.sh ---------- #!/bin/sh # Purpose: To write a script to add user to the system. # Name: adduser ### Set a shell variable to test the grep command. name=nuucp # Should match a single entry #name=uucp # Should match a single entry #name=root # Should match a single entry #name=rot # Should not match any entry grep "^$name:" ./mypasswd # End of lab 4