Enabling Process Accounting on Linux HOWTO
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# 7. Miscellaneous Process Accounting Commands

ac

  ac prints out statistics about users' connection times in hours based on the logins and logouts in the current `/var/log/wtmp` file. ac is also capable of printing out time totals for each day (-d option), and for each user (-p option).

accton

  accton is used to turn on or turn off process accounting. The file is normally executed at system bootup or shutdown via system init scripts.

last

  last goes through the `/var/log/wtmp` file and prints out information about users' connection times.

sa

  sa summarizes accounting information from previously executed commands, software I/O operation times, and CPU times, as recorded in the accounting record file `/var/account/pacct`.

lastcomm

  lastcomm prints out the information about all previously executed commands, recorded in `/var/account/pacct`.

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