I would like to create two entries for the sudoers configuration file:
(a) One entry that allows a user pat, cindy, and tim to service the printer, unjam it, restart printer daemons on the machine printserver.

Is what I did correct? Because I am unable to access the sudoers configuration file.

The sudoers file allows me to group according to function, so I will assign an alias called PrinterAdmins.

User_Alias PrinterAdmins = pat, cindy, tim, %operator
PrinterAdmins ALL = !/usr/bin/su, !SHELLS

Cmnd_Alias PRINTING = /usr/sbin/lpc, /usr/bin/lprm
Cmnd_Alias REBOOT = /usr/sbin/reboot, /usr/sbin/fastboot
Cmnd_Alias SHELLS = /usr/bin/sh, /usr/bin/csh, \
/usr/bin/ksh, /usr/local/bin/tcsh, \
/usr/bin/rsh, /usr/local/bin/zsh

Also, (b) One entry that allows drew, smithgr and jimlane to kill jobs and reboot the machines in the student lab. Is that correct???

User_Alias StudentAdmins = drew, smithgr, jimlane, % operator
StudentAdmins ALL = !/usr/bin/su, !SHELLS

Cmnd_Alias Kill= /usr/bin/kill
Cmnd_Alias REBOOT = /usr/sbin/reboot, /usr/sbin/fastboot


Thank you in advance

1) sudo visudo

2) sudo -i
vi sudoers

First way is cleaner.