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Monitoring User Activity with psacct On Linux

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One of the big advantages of using psacct on your server is that it provides excellent logging for activities of applications and users. Installation :- for Redhat, Fedora, CentOs yum install psacct service psacct start For Ubuntu Debian apt-get install acct service acct start How to use psacct : The connect time in hours is based on logins and logouts.  root@Vishalvyas:~#   ac -p         vishal                        9.12         Ashish                      20.60         Vipul                        15.80         Anil                          17.33         Akshay                     10.92         pritesh                      4.10         chirag                       8.75         total                         168.95 Which user has executed what command on system : root@Vishalvyas:~# lastcomm vishal Process        Flag    Username  Terminal    Time vim                          X vishal        pts/2         0.01 secs Tue Mar  5 10:16 su               S           vishal