Kill pidof top pstree

find / ! -user root ! -user bin ! -user student -ls 2 > /dev/null
find / -perm +7000 -exec ls -l {} \;

ps axf -o pid,comm,%cpu,%mem,state,tty,euser,ruser,nice

ps aux

比较如下三种方法：
$ ps axo pid,comm|grep 'cups'
2734 cupsd
3502 eggcups

$ pgrep cups
2734
3502

$ pidof cupsd      获取进程 PID 最准确的方法
2734

( man 7 signal )
kill 3428  = kill -9 3428
kill -15 3428 = kill -SIGTERM 3428

killall syslogd
service syslog status

ping -c1 -W1 baidu.com
---------------------------------------------------------

ps axo pid,comm,pcpu --sort=-pcpu
top -d 2
top -b -n 2 > /tmp/top.log
top -d 2 -p 3721

pstree -Aup

dmesg | grep -i hd
uptime
uname -r
free -m
vmstat 1 3      (1/secs total:3)
vmstat -d

yum install -y sysstat
iostat -d 2 3


lsof -u root -a -U
lsof +d /dev
lsof -u root | grep bash

pifof init syslogd

man 7 signal (kill -l)

SIGHUP  1
SIGINT  2
SIGKILL 9
SIGTERM 15
SIGSTOP 17,19,23

kill -15 3721
killall -15 cupsd

PRI(new)=PRI(old) + nice
nice (-20 ~ 19)
root: -20 ~ 19
genuser: 0 ~ 19

nice -n -5 vi &
renice 10 3721
# Open telnet login for root

# delete or rename "/etc/securetty"
mv /etc/securetty /etc/securetty.bak

# vim /etc/pam.d/login and comment the item below
#auth   required        pam_securetty.so

# ATTENTION: I advise you not to do that..
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