Linux / Unix ac command

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About ac
Syntax
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About ac

Prints statistics about users' connect time.

Syntax

-d, --daily-totals	Print totals for each day rather than just one big total at the end.
-y, --print-year	Print year when displaying dates.
-p, --individual-totals	Print time totals for each user in addition to the usual everything-lumped-into-one value.
people	Print out the sum total of the connect time used by all of the users included in people. Note that people is a space separated list of valid user names; wildcards are not allowed.
-f, --file filename	Read from the file filename instead of the system's wtmp file.
-a --all-days	If we're printing daily totals, print a record for every day instead of skipping intervening days where there is no login activity. Without this flag, time accrued during those intervening days gets listed under the next day where there is login activity.
--complain	When the wtmp file has a problem (a time-warp, missing record, or whatever), print out an appropriate error.
--reboots	Reboot records are NOT written at the time of a reboot, but when the system restarts; therefore, it is impossible to know exactly when the reboot occurred. Users may have been logged into the system at the time of the reboot, and many ac's automatically count the time between the login and the reboot record against the user (even though all of that time shouldn't be, perhaps, if the system is down for a long time, for instance). If you want to count this time, include the flag. For vanilla ac compatibility, include this flag.
--supplants	Sometimes, a logout record is not written for a specific terminal, so the time that the last user accrued cannot be calculated. If you want to include the time from the user's login to the next login on the terminal (though probably incorrect), include this you want to include the time from the user's login to the next login on the terminal (though probably incorrect), include this flag. For vanilla ac compatibility, include this flag.
--timewarps	Sometimes, entries in a wtmp file will suddenly jump back into the past without a clock change record occurring. It is impossible to know how long a user was logged in when this occurs. If you want to count the time between the login and the time warp against the user, include this flag. For vanilla ac compatibility, include this flag.
--compatibility	This is shorthand for typing out the three above options.
--tw-leniency num	Set the time warp leniency to num seconds. Records in wtmp files might be slightly out of order (most notably when two logins occur within a one-second period - the second one gets written first). By default, this value is set to 60. If the program notices this problem, time is not assigned to users unless the --timewarps flag is used.
--tw-suspcious num	Set the time warp suspicious value to num seconds. If two records in the wtmp file are farther than this number of seconds apart, there is a problem with the wtmp file (or your machine hasn't been used in a year). If the program notices this problem, time is not assigned to users unless the --timewarps flag is used.
--z, --print-zeros	If a total for any category (save the grand total) is zero, print it. The default is to suppress printing.
--debug	Print verbose internal information.
-V, --version	Print the version number of ac to standard output and quit.
-h, --help	Prints the usage string and default locations of system files to standard output and exits.

Examples

ac -d -y - Would display results similar to:

Feb 1 2001 total 81.59
Feb 2 2001 total 523.74
Feb 3 2001 total 492.98
Feb 4 2001 total 416.68
Feb 5 2001 total 677.33
Feb 6 2001 total 855.50
Feb 7 2001 total 821.41
Feb 8 2001 total 806.81
Feb 9 2001 total 847.93
Today total 641.46

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