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Linux Process Management(20) > skill, snice send a signal or report process status
> pstree display a tree of processes
> pgrep, pkill look up or signal processes based on name and
> other attributes
> free Display amount of free and used memory in the system
> uptime Tell how long the system has been running.
> w Show who is logged on and what they are doing.
> pidof find the process ID of a running program.
> fuser identify processes using files or sockets
> sleep, usleep delay for a specified amount of time
> time counting running time of a command
> jobs show stopped processes list
> history command history
> nohup run a command immune to hangups, with output to a non-tty
> at, batch, atq, atrm queue, examine or delete jobs for later
> execution
> crontab maintain crontab files for individual users
> bg, fg let stopped process run on background, foreground
> procinfo display system status gathered from /proc
> reboot, halt, shutdown, poweroff stop the system
>
> 2. /proc
> 1. apm: advanced power manager
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