基础命令

cat cd chmod chown cp cut -d ' ' find less ln locate<--->updatedb less ls more mv rm rmdir split touch at  atq  atrm  atd cal date crontab sleep uptime time 测量指令消耗的资源、 chfn  finger  w    who chsh last passwd mail mesg  talk wall write kill pkill xkill  killall nice ps -aux    pstree top expr  tr   reset  done to cat `which cat`

lsmod lspci lsof nslookup dig sockstat nohup fuser tcsh swapon lftp links] top uptime vmstat ps renice &     fg    bg 进程的定时执行 cron crontab -e at,atq,atrm