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* Description: Linux command of checking last login time for OS users
* Date: 06:09 PM EST, 01/16/2018
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<1> Linux command of checking OS user last login period for audting purpose:
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     |__ $ last
	 
                 sadon    pts/0        host-74-204-70-2 Fri Sep  1 18:29 - 20:42 (6+02:13)
                 gride    pts/0        208.67.98.72     Thu Aug 31 22:03 - 22:04  (00:00)
                 gride    pts/0        208.67.98.72     Thu Aug 31 22:01 - 22:03  (00:01)
                 dknos    pts/1        208.67.98.72     Wed Aug 30 20:28 - 20:34  (00:06)
                 ec2-user pts/0        c-69-251-71-149. Wed Aug 30 20:14 - 22:32  (02:17)
                 dknox    pts/0        c-69-251-71-149. Wed Aug 30 20:14 - 20:14  (00:00)
                 ec2-user pts/0        c-69-251-71-149. Wed Aug 30 20:06 - 20:13  (00:07)
                 ckennedy pts/1        c-69-251-71-149. Tue Aug 29 21:26 - 21:29  (00:03)
                 reboot   system boot  4.9.38-16.35.amz Tue Aug 29 20:55 - 21:43 (121+00:48)

                 wtmp begins Tue Aug 29 20:55:30 2017