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程序控制相關指令

at	在指定時間執行作業 (單次不重複)
batch	在系統負載不太高時執行作業
cron	在指定時間執行作業 (重複)
crontab	編輯每個使用者的「cron 表」文件，指定要執行哪些命令以及何時執行。
fuser	找出使用特定檔案或 socket 的程序
kill	向一個或多個程序發送終止訊號 (殺掉一個程序)
nice	在啟動程序之前更改其優先權
ps	列印正在執行的程序的資訊
renice	變更一個執行中的程序之優先權
sleep	暫停程序的執行指定的秒數
top	以互動方式顯示系統中 CPU 佔用最高的作業
wait	Shell 內建指令，用於等待一個或多個程序完成

Commands for Processes

at	Executes jobs at a specified time. at schedules jobs to be executed just once, whereas cron schedules them to be executed regularly.
batch	Executes jobs when the system is not too overloaded.
cron	Executes jobs at specified times.
crontab	Edit per-user "cron table" files that specify what commands to run, and when.
fuser	Find processes using particular files or sockets.
kill	Send a signal to one or more processes.
nice	Change the priority of a process before starting it.
ps	Process status. Print information about running processes.
renice	Change the priority of a process that has already been started.
sleep	Stop execution for the given number of seconds.
top	Interactively display the most CPU-intensive jobs on the system.
wait	Shell built-in command to wait for one or more processes to complete.
xargs	Read strings on standard input, passing as many as possible as arguments to a given command. Most often used together with find.