ac command prints out a report of connect time (in hours) based on the logins/logouts in the current wtmp file. A total is also printed out.
Syntax:
# ac [options]
Example:
$ ac
total 1774.81
ac Command Examples
1. To get the connect time for a user:
# ac root
2. To get the daily totals:
# ac -d
3. To get the individual totals:
# ac -p
4. To get the verbose internal information:
# ac --debug
5. To get the version of the “ac” command:
# ac -V