#lsof 列出当前系统打开文件，常与-i选项使用，用于查看某个端口被哪个程序占用
[root@bogon ~]# lsof -i:80
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
httpd 6701 root 4u IPv6 64259 0t0 TCP *:http (LISTEN)
httpd 6702 apache 4u IPv6 64259 0t0 TCP *:http (LISTEN)
httpd 6703 apache 4u IPv6 64259 0t0 TCP *:http (LISTEN)
httpd 6704 apache 4u IPv6 64259 0t0 TCP *:http (LISTEN)
httpd 6705 apache 4u IPv6 64259 0t0 TCP *:http (LISTEN)
httpd 6706 apache 4u IPv6 64259 0t0 TCP *:http (LISTEN)
[root@bogon ~]# lsof -i:22
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
sshd 931 root 3u IPv4 20955 0t0 TCP *:ssh (LISTEN)
sshd 931 root 4u IPv6 20965 0t0 TCP *:ssh (LISTEN)
sshd 3926 root 3u IPv4 36374 0t0 TCP bogon:ssh->bogon:53436 (ESTABLISHED)
[root@bogon ~]#
#获取终端上所有用户的有关进程的所有信息
[root@bogon ~]# ps -aux
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 1 0.0 0.4 128092 4724 ? Ss Jun25 0:03 /usr/lib/systemd/syste
root 2 0.0 0.0 0 0 ? S Jun25 0:00 [kthreadd]
root 3 0.0 0.0 0 0 ? S Jun25 0:00 [ksoftirqd/0]
root 6 0.0 0.0 0 0 ? S Jun25 0:00 [kworker/u256:0]
root 7 0.0 0.0 0 0 ? S Jun25 0:00 [migration/0]
root 8 0.0 0.0 0 0 ? S Jun25 0:00 [rcu_bh]
root 9 0.0 0.0 0 0 ? R Jun25 0:01 [rcu_sched]
root 10 0.0 0.0 0 0 ? S Jun25 0:00 [watchdog/0]
root 12 0.0 0.0 0 0 ? S< Jun25 0:00 [khelper]
root 13 0.0 0.0 0 0 ? S Jun25 0:00 [kdevtmpfs]
root 14 0.0 0.0 0 0 ? S< Jun25 0:00 [netns]
root 15 0.0 0.0 0 0 ? S Jun25 0:00 [khungtaskd]
root 16 0.0 0.0 0 0 ? S< Jun25 0:00 [writeback]
root 17 0.0 0.0 0 0 ? S< Jun25 0:00 [kintegrityd]
root 18 0.0 0.0 0 0 ? S< Jun25 0:00 [bioset]
root 19 0.0 0.0 0 0 ? S< Jun25 0:00 [kblockd]
root 20 0.0 0.0 0 0 ? S< Jun25 0:00 [md]
root 26 0.0 0.0 0 0 ? S Jun25 0:00 [kswapd0]
root 27 0.0 0.0 0 0 ? SN Jun25 0:00 [ksmd]
root 28 0.0 0.0 0 0 ? SN Jun25 0:00 [khugepaged]
root 29 0.0 0.0 0 0 ? S Jun25 0:00 [fsnotify_mark]
root 30 0.0 0.0 0 0 ? S< Jun25 0:00 [crypto]
root 38 0.0 0.0 0 0 ? S< Jun25 0:00 [kthrotld]
root 40 0.0 0.0 0 0 ? S< Jun25 0:00 [kmpath_rdacd]
root 41 0.0 0.0 0 0 ? S< Jun25 0:00 [kpsmoused]
root 43 0.0 0.0 0 0 ? S< Jun25 0:00 [ipv6_addrconf]
root 62 0.0 0.0 0 0 ? S< Jun25 0:00 [deferwq]
root 94 0.0 0.0 0 0 ? S Jun25 0:00 [kauditd]
root 233 0.0 0.0 0 0 ? S< Jun25 0:00 [mpt_poll_0]
root 234 0.0 0.0 0 0 ? S< Jun25 0:00 [ata_sff]
root 235 0.0 0.0 0 0 ? S< Jun25 0:00 [mpt/0]
root 241 0.0 0.0 0 0 ? S Jun25 0:00 [scsi_eh_0]
root 243 0.0 0.0 0 0 ? S< Jun25 0:00 [scsi_tmf_0]
root 245 0.0 0.0 0 0 ? S Jun25 0:00 [scsi_eh_1]
root 246 0.0 0.0 0 0 ? S Jun25 0:00 [kworker/u256:2]
。。。。。。
#获取某服务程序的所有进程号
[root@bogon ~]# pgrep httpd
6701
6702
6703
6704
6705
6706
#杀死进程，killall通过程序名字杀死所有进程
[root@bogon ~]# killall httpd
[root@bogon ~]# pgrep httpd
[root@bogon ~]#
#kill杀死程序
[root@bogon ~]# cat a.sh #死循环
#!/bin/bash
while true
do
echo "linux">/dev/null
done
[root@bogon ~]# ./a.sh
^Z
[1]+ Stopped ./a.sh
[root@bogon ~]# ps
PID TTY TIME CMD
3930 pts/1 00:00:00 bash
11719 pts/1 00:00:01 a.sh
11729 pts/1 00:00:00 ps
[root@bogon ~]# kill 11719 #偶然间发现这个问题，原因暂时不明
[root@bogon ~]# ps
PID TTY TIME CMD
3930 pts/1 00:00:00 bash
11719 pts/1 00:00:01 a.sh
11733 pts/1 00:00:00 ps
[root@bogon ~]# kill -9 11719 #既然普通kill无法杀死，那么就发送-9信号直接强制杀死，问题解决
[root@bogon ~]# ps
PID TTY TIME CMD
3930 pts/1 00:00:00 bash
11734 pts/1 00:00:00 ps
[1]+ Killed ./a.sh
[root@bogon ~]# ./a.sh &
[1] 11735
[root@bogon ~]# ps
PID TTY TIME CMD
3930 pts/1 00:00:00 bash
11735 pts/1 00:00:01 a.sh
11736 pts/1 00:00:00 ps
[root@bogon ~]# kill 11735 #普通后台运行程序可以直接kill
[root@bogon ~]# ps
PID TTY TIME CMD
3930 pts/1 00:00:00 bash
11737 pts/1 00:00:00 ps
[1]+ Terminated ./a.sh
[root@bogon ~]#
