lab46:~$ grep ^[jcs].*$ -m4 lastoutput.txt
jserosky pts/76       cpe-24-94-58-131 Sun Apr 28 12:54   still logged in
jmendoza pts/76       pool-96-238-204- Fri Apr 26 22:07 - 01:00  (02:52)
jcavalu3 pts/79       cpe-69-205-131-2 Fri Apr 26 21:40 - 21:46  (00:05)
cclay    pts/76       cpe-67-255-36-68 Fri Apr 26 20:17 - 20:37  (00:19)
lab46:~$