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场景一：文件系统使用率很高，但是找不到具体哪个文件占用了空间测试：
Testlsof.sh #!/bin/sh cnt=1 while (( cnt < 1000 )) do echo " TEST lsof command " sleep 1 cnt=`expr $cnt + 1` done 在一个窗口运行Testlsof.sh [root@limt ~]# sh Testlsof.sh > testlsof.log 打开另外一个窗口 [root@limt ~]# rm -rf testlsof.log 这个时候ls会发现testlsof.log不存在了 然后查看Testlsof.sh进程号 [root@limt ~]# ps -ef|grep Testlsof.sh root 10996 10269 0 10:06 pts/3 00:00:00 sh Testlsof.sh root 11269 10162 0 10:07 pts/2 00:00:00 grep Testlsof 使用lsof命令可以看到testlsof.log仍被 Testlsof.sh进程打开，但是后面有个delete的字样 [root@limt ~]# lsof -p 10996 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sh 10996 root cwd DIR 253,1 4096 524289 /root sh 10996 root rtd DIR 253,1 4096 2 / sh 10996 root txt REG 253,1 938768 475247 /bin/bash sh 10996 root mem REG 253,1 156872 975392 /lib64/ld-2.12.so sh 10996 root mem REG 253,1 22536 975399 /lib64/libdl-2.12.so sh 10996 root mem REG 253,1 1922152 975393 /lib64/libc-2.12.so sh 10996 root mem REG 253,1 138280 975059 /lib64/libtinfo.so.5.7 sh 10996 root mem REG 253,10 69952 394158 /usr/lib64/gconv/libGB.so sh 10996 root mem REG 253,10 16976 393954 /usr/lib64/gconv/EUC-CN.so sh 10996 root mem REG 253,10 99154480 524306 /usr/lib/locale/locale-archive sh 10996 root mem REG 253,10 26060 394165 /usr/lib64/gconv/gconv-modules.cache sh 10996 root 0u CHR 136,3 0t0 6 /dev/pts/3 sh 10996 root 1w REG 253,1 2160 526093 /root/testlsof.log (deleted) //此处便是占用空间的文件 sh 10996 root 2u CHR 136,3 0t0 6 /dev/pts/3 sh 10996 root 255r REG 253,1 105 526097 /root/Testlsof.sh
[root@limt ~]# lsof|grep delete sh 10996 root 1w REG 253,1 2720 526093 /root/testlsof.log (deleted) 然后根据进程号找出进程名 [root@limt ~]# ps -ef|grep 10996 root 10996 10269 0 10:06 pts/3 00:00:00 sh Testlsof.sh
root@limt ~]# nohup sh Testlsof.sh > 111.log & [1] 14170 [root@limt ~]# nohup: 忽略输入重定向错误到标准输出端 获得进程名字，查看此进程打开的文件 [root@limt ~]# ps -ef|grep Testlsof root 14170 13132 0 10:21 pts/5 00:00:00 sh Testlsof.sh root 14183 13132 0 10:21 pts/5 00:00:00 grep Testlsof [root@limt ~]# lsof -p 14170 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sh 14170 root cwd DIR 253,1 4096 524289 /root sh 14170 root rtd DIR 253,1 4096 2 / sh 14170 root txt REG 253,1 938768 475247 /bin/bash sh 14170 root mem REG 253,1 156872 975392 /lib64/ld-2.12.so sh 14170 root mem REG 253,1 22536 975399 /lib64/libdl-2.12.so sh 14170 root mem REG 253,1 1922152 975393 /lib64/libc-2.12.so sh 14170 root mem REG 253,1 138280 975059 /lib64/libtinfo.so.5.7 sh 14170 root mem REG 253,10 69952 394158 /usr/lib64/gconv/libGB.so sh 14170 root mem REG 253,10 16976 393954 /usr/lib64/gconv/EUC-CN.so sh 14170 root mem REG 253,10 99154480 524306 /usr/lib/locale/locale-archive sh 14170 root mem REG 253,10 26060 394165 /usr/lib64/gconv/gconv-modules.cache sh 14170 root 0w CHR 1,3 0t0 3842 /dev/null sh 14170 root 1w REG 253,1 280 526102 /root/111.log //此处便是日志输出文件（0,1,2是进程默认打开的文件描述符） sh 14170 root 2w REG 253,1 280 526102 /root/111.log //这里我们是把1,2的文件描述符重定向到111.log sh 14170 root 255r REG 253,1 105 526097 /root/Testlsof.sh
场景三：查看某个端口是被那个进程打开
</pre><pre code_snippet_id="557768" snippet_file_name="blog_20141221_3_2022099" name="code" class="python">[root@limt ~]# lsof -i:22 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 2589 root 3u IPv4 16268 0t0 TCP *:ssh (LISTEN) sshd 2589 root 4u IPv6 16270 0t0 TCP *:ssh (LISTEN) sshd 2665 root 3u IPv4 16523 0t0 TCP 192.168.1.104:ssh->limt:59580 (ESTABLISHED) sshd 10157 root 3u IPv4 75435 0t0 TCP 192.168.1.104:ssh->limt:49212 (ESTABLISHED) sshd 13110 root 3u IPv4 94454 0t0 TCP 192.168.1.105:ssh->limt:49285 (ESTABLISHED) 可以看到2589进程在IPv4和IPv6打开了22进程端口
场景四：在卸载一个文件系统时候报device is busy
[root@limt ~]# umount /yunwei/
umount: /yunwei: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
[root@limt ~]# lsof /yunwei/
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
bash 13132 root cwd DIR 253,5 4096 2 /yunwei
[root@limt ~]# ps -ef|grep 13132
root 13132 13110 0 10:15 pts/5 00:00:00 -bash
root 17262 15204 0 10:42 pts/6 00:00:00 grep 13132
[root@limt ~]#
[root@limt ~]# kill -9 13132
[root@limt ~]# umount /yunwei/
[root@limt ~]# ps -ef|grep more root 17369 17330 0 10:44 pts/0 00:00:00 more 111.log root 17390 15204 0 10:45 pts/6 00:00:00 grep more [root@limt ~]# cd /proc/17369 [root@limt 17369]# pwd /proc/17369 [root@limt 17369]# ls attr clear_refs cwd fdinfo maps mountstats oom_score root smaps status autogroup cmdline environ io mem net oom_score_adj sched stack syscall auxv coredump_filter exe limits mountinfo numa_maps pagemap schedstat stat task cgroup cpuset fd loginuid mounts oom_adj personality sessionid statm wchan [root@limt 17369]# cd fd [root@limt fd]# ls -lrt 总用量 0 lrwx------. 1 root root 64 12月 19 10:45 2 -> /dev/pts/0 lr-x------. 1 root root 64 12月 19 10:46 3 -> /root/111.log lrwx------. 1 root root 64 12月 19 10:46 1 -> /dev/pts/0 lrwx------. 1 root root 64 12月 19 10:46 0 -> /dev/pts/0 可以看到文件描述符3就是/root/111.log
[root@limt fd]# ps -ef|grep ssh root 2589 1 0 07:40 ? 00:00:00 /usr/sbin/sshd root 13110 2589 0 10:15 ? 00:00:00 sshd: root@pts/0,pts/6 root 17491 15204 0 10:47 pts/6 00:00:00 grep ssh [root@limt fd]# cd /proc/2589 [root@limt 2589]# cd fd [root@limt fd]# ls 0 1 2 3 4 [root@limt fd]# ls -lrt 总用量 0 lrwx------. 1 root root 64 12月 19 10:29 4 -> socket:[16270] //打开了两个socket lrwx------. 1 root root 64 12月 19 10:29 3 -> socket:[16268] lrwx------. 1 root root 64 12月 19 10:29 2 -> /dev/null lrwx------. 1 root root 64 12月 19 10:29 1 -> /dev/null lrwx------. 1 root root 64 12月 19 10:29 0 -> /dev/null [root@limt fd]# [root@limt fd]# netstat -an|grep 22 tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 52 192.168.1.105:22 192.168.1.103:49285 ESTABLISHED tcp 0 0 :::22 :::* LISTEN [root@limt fd]# [root@limt fd]# lsof -p 2589 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 2589 root cwd DIR 253,1 4096 2 / sshd 2589 root rtd DIR 253,1 4096 2 / sshd 2589 root txt REG 253,10 526008 581654 /usr/sbin/sshd sshd 2589 root mem REG 253,1 65928 974878 /lib64/libnss_files-2.12.so sshd 2589 root mem REG 253,1 243096 975421 /lib64/libnspr4.so sshd 2589 root mem REG 253,1 17096 975423 /lib64/libplds4.so sshd 2589 root mem REG 253,1 21256 975422 /lib64/libplc4.so sshd 2589 root mem REG 253,10 177952 439737 /usr/lib64/libnssutil3.so sshd 2589 root mem REG 253,1 145720 975396 /lib64/libpthread-2.12.so sshd 2589 root mem REG 253,1 12592 975408 /lib64/libkeyutils.so.1.3 sshd 2589 root mem REG 253,1 46368 975410 /lib64/libkrb5support.so.0.1 sshd 2589 root mem REG 253,1 386040 975419 /lib64/libfreebl3.so sshd 2589 root mem REG 253,1 1922152 975393 /lib64/libc-2.12.so sshd 2589 root mem REG 253,10 1286744 451926 /usr/lib64/libnss3.so sshd 2589 root mem REG 253,1 17256 975412 /lib64/libcom_err.so.2.1 sshd 2589 root mem REG 253,1 177520 975411 /lib64/libk5crypto.so.3.1 sshd 2589 root mem REG 253,1 944712 975413 /lib64/libkrb5.so.3.3 sshd 2589 root mem REG 253,1 280520 975414 /lib64/libgssapi_krb5.so.2.2 sshd 2589 root mem REG 253,1 113952 975403 /lib64/libresolv-2.12.so sshd 2589 root mem REG 253,1 43392 975420 /lib64/libcrypt-2.12.so sshd 2589 root mem REG 253,1 116368 974900 /lib64/libnsl-2.12.so sshd 2589 root mem REG 253,1 91096 975398 /lib64/libz.so.1.2.3 sshd 2589 root mem REG 253,1 17520 975404 /lib64/libutil-2.12.so sshd 2589 root mem REG 253,10 1665328 436731 /usr/lib64/libcrypto.so.1.0.0 sshd 2589 root mem REG 253,1 124624 975409 /lib64/libselinux.so.1 sshd 2589 root mem REG 253,1 22536 975399 /lib64/libdl-2.12.so sshd 2589 root mem REG 253,1 58480 975442 /lib64/libpam.so.0.82.2 sshd 2589 root mem REG 253,1 115536 975434 /lib64/libaudit.so.1.0.0 sshd 2589 root mem REG 253,1 43256 975444 /lib64/libwrap.so.0.7.6 sshd 2589 root mem REG 253,1 12688 975098 /lib64/libfipscheck.so.1.1.0 sshd 2589 root mem REG 253,1 156872 975392 /lib64/ld-2.12.so sshd 2589 root 0u CHR 1,3 0t0 3842 /dev/null sshd 2589 root 1u CHR 1,3 0t0 3842 /dev/null sshd 2589 root 2u CHR 1,3 0t0 3842 /dev/null sshd 2589 root 3u IPv4 16268 0t0 TCP *:ssh (LISTEN) sshd 2589 root 4u IPv6 16270 0t0 TCP *:ssh (LISTEN) 可以看到lsof显示的两个TCP文件的DEVICE与/proc一致（16268，16270）
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原文地址：http://blog.csdn.net/lmt818583/article/details/42058451
