ac - print statistics about users' connect time
- [ -d | --daily-totals ] [ -y |
[ -p | --individual-totals ] [ people ]
[ -f | --file filename ] [ -a |
[ --complain ] [ --reboots ] [ --supplants ]
[ --timewarps ] [ --compatibility ]
[ --tw-leniency num ] [ --tw-suspicious num ]
[ -z | --print-zeros ] [ --debug ]
[ -V | --version ] [ -h | --help ]
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.
The accounting file wtmp
is maintained by init(8)
. Neither ac
creates the wtmp
it doesn't exist, no accounting is done. To begin accounting, create the file
with a length of zero.
NOTE: The wtmp
file can get really big, really fast. You might want to
trim it every once and a while.
works nearly the same u*x ac
, though it's a little smarter
in several ways. You should therefore expect differences in the output of GNU
and the output of ac
's on other systems. Use the command
to get additional information.
- -d, --daily-totals
- Print totals for each day rather than just one big total at
the end. The output looks like this:
Jul 3 total 1.17
Jul 4 total 2.10
Jul 5 total 8.23
Jul 6 total 2.10
Jul 7 total 0.30
- -p, --individual-totals
- Print time totals for each user in addition to the usual
everything-lumped-into-one value. It looks like:
- 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
- When the wtmp file has a problem (a time-warp,
missing record, or whatever), print out an appropriate error.
- 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.*
- 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.*
- 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 is shorthand for typing out the three above
- -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.
- --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
- --tw-suspicious 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
- -y, --print-year
- Print year when displaying dates.
- -z, --print-zeros
- If a total for any category (save the grand total) is zero,
print it. The default is to suppress printing.
- Print verbose internal information.
- -V, --version
- Print the version number of ac to standard output
- -h, --help
- Prints the usage string and default locations of system
files to standard output and exits.
The system wide login record file. See
for further details.
The GNU accounting utilities were written by Noel Cragg
<email@example.com>. The man page was adapted from the accounting
texinfo page by Susan Kleinmann <firstname.lastname@example.org>.