ac 命令

常用示例

说明

ac generates a report of connect time in hours based on the logins and logouts recorded in the system's wtmp file. It calculates the difference between login and logout timestamps to determine how long each user has been connected. Output can be broken down by individual user, by day, or presented as an aggregate total. The wtmp file is maintained automatically by login-related system utilities such as login, sshd, and init.

参数

-d, --daily-totals

Display totals for each calendar day instead of a single aggregate total

-p, --individual-totals

Show connection time for each user separately plus overall total

people

Calculate combined connect time for specified usernames (space-separated list)

-f, --file filename

Read accounting data from specified file instead of system wtmp

-a, --all-days

Include daily records even when no login activity occurred

-y, --print-year

Display year alongside date information

-z, --print-zeros

Print category totals that equal zero

--complain

Display errors when wtmp file contains anomalies

--reboots

Include time accrued between user login and system reboot events

--supplants

Count time from login to next login when logout records are missing

--timewarps

Include time when chronological inconsistencies occur in wtmp

--compatibility

Enable all three compatibility flags (reboots, supplants, timewarps)