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ac(8) [netbsd man page]

AC(8)							    BSD System Manager's Manual 						     AC(8)

NAME
ac -- display connect time accounting SYNOPSIS
ac [-d | -p] [-t tty] [-w file] [users ...] DESCRIPTION
If the file /var/log/wtmp exists, a record of individual login and logout times are written to it by login(1) and init(8), respectively. The program ac examines these records and writes the accumulated connect time for all logins to the standard output. Options available: -d Display the connect times in 24 hour chunks. -p Display individual user totals. -t tty Only do accounting logins on certain ttys. The tty specification can start with '!' to indicate not this tty and end with '*' to indicate all similarly named ttys. Multiple -t flags may be specified. -w file Read raw connect time data from file instead of the default file /var/log/wtmp. users ... Display totals for the given individuals only. If no arguments are given, ac displays the total amount of login time for all active accounts on the system. The default wtmp file is an infinitely increasing file unless frequently truncated. This is normally done by the daily daemon scripts sched- uled by cron(8), which rename and rotate the wtmp files before truncating them (and keep about a week's worth on hand). No login times are collected, however, if the file does not exist. For example, ac -p -t "ttyd*" > modems ac -p -t "!ttyd*" > other allows times recorded in modems to be charged out at a different rate than other. The ac utility exits 0 on success, and >0 if a fatal error occurs. FILES
/var/log/wtmp connect time accounting file /var/log/wtmp.[0-7] rotated files SEE ALSO
login(1), utmp(5), init(8), sa(8) HISTORY
An ac command appeared in Version 6 AT&T UNIX. This version of ac was written for NetBSD 1.0 from the specification provided by various sys- tems' manual pages. BSD
April 19, 1994 BSD

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WHO(1)							    BSD General Commands Manual 						    WHO(1)

NAME
who -- display who is on the system SYNOPSIS
who [-HmqsTu] [am I] [file] DESCRIPTION
The who utility displays information about currently logged in users. By default, this includes the login name, tty name, date and time of login and remote hostname if not local. The options are as follows: -H Write column headings above the output. -m Show information about the terminal attached to standard input only. -q ``Quick mode'': List the names and number of logged in users in columns. All other command line options are ignored. -s Show the name, line and time fields only. This is the default. -T Indicate whether each user is accepting messages. One of the following characters is written: + User is accepting messages. - User is not accepting messages. ? An error occurred. -u Show idle time for each user in hours and minutes as hh:mm, '.' if the user has been idle less that a minute, and ``old'' if the user has been idle more than 24 hours. am I Equivalent to -m. By default, who gathers information from the file /var/run/utmp. An alternate file may be specified which is usually /var/log/wtmp (or /var/log/wtmp.[0-6] depending on site policy as wtmp can grow quite large and daily versions may or may not be kept around after compression by ac(8)). The wtmp file contains a record of every login, logout, crash, shutdown and date change since wtmp was last truncated or created. If /var/log/wtmp is being used as the file, the user name may be empty or one of the special characters '|', '}' and '~'. Logouts produce an output line without any user name. For more information on the special characters, see utmp(5). ENVIRONMENT
The COLUMNS, LANG, LC_ALL and LC_TIME environment variables affect the execution of who as described in environ(7). FILES
/var/run/utmp /var/log/wtmp /var/log/wtmp.[0-6] DIAGNOSTICS
The who utility exits 0 on success, and >0 if an error occurs. SEE ALSO
last(1), users(1), w(1), utmp(5) STANDARDS
The who utility conforms to IEEE Std 1003.1-2001 (``POSIX.1''). HISTORY
A who command appeared in Version 1 AT&T UNIX. BSD
May 8, 2002 BSD
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