Process monitoring commands
ps, top, htop, atop, prtstat, pidstat, prlimit, pmap, gstack, pstree, kill, pkill, killall, nice, renice, ionice & lsof.

 

Process related commands
pgrep, bg, fg, &, jobs, nohup, disown, stty, tty, clear, reset, time, timeout, sleep, usleep, watch & strace.

 

Performance monitoring commands
mpstat, vmstat, iostat, sar, sadc, sa1, netstat, slaptop, ipcs, ipcmk & ipcrm.

 

User session monitoring commands
last, lastb, lslogins, id, logname, groups, users, w, who, whoami & who am i.