Opbzil

An easy function to get a process tree listing (very detailed) for all the processes of any gived user.

# psu(){ command ps -Hcl -F S f -u ${1:-$USER}; }

# psu uadmin

F S UID        PID  PPID CLS PRI ADDR SZ WCHAN    RSS PSR STIME TTY        TIME CMD

5 S uadmin   23028 23026 TS   18 -  2481 -       1600   0 08:04 ?          0:00 sshd: uadmin@pts/0

0 S uadmin   23029 23028 TS   20 -  1168 -       1464   0 08:04 pts/0      0:01  \_ -bash

Want to know why your load average is so high? Run this command to see what processes are on the run queue. Runnable processes have a status of “R”, and commands waiting on I/O have a status of “D”.

# ps -eo stat,pid,user,command | egrep "^STAT|^D|^R"

Sometimes you need to use a port that is already opened by some program , and you don't know who to “kill” for it to release - so, now you do !

# lsof -i tcp:22

# lsof -i tcp:80

dstat - a mix of vmstat, iostat, netstat, ps, sar…

# dstat -ta

vmstat/iostat with timestamp. Also useful with iostat, or pretty much anything else you want timestamped.

# vmstat 1 | awk '{now=strftime("%Y-%m-%d %T "); print now $0}'