lsof

[nonocast]

lsof - list open files

在linux下everything is file, 所以lsof是利器。

• 查看端口占用情况
  通过nc -l 9999打开端口，然后用lsof -i :9999查看占用情况

lsof -i :9999
COMMAND   PID     USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
nc      19856 nonocast    3u  IPv4 0x59c33e997832cee1      0t0  TCP *:distinct (LISTEN)

• 查看文件占用情况
  通过touch foo创建文件, 然后tail -f foo占用掉这个文件, 最后lsof foo查看占用情况

$ lsof foo
COMMAND   PID     USER   FD   TYPE DEVICE SIZE/OFF     NODE NAME
tail    19728 nonocast    3r   REG    1,4       12 64987891 foo

• 查看进程占用情况

 lsof -p 3137 
COMMAND   PID     USER   FD      TYPE             DEVICE   SIZE/OFF                NODE NAME
Evernote 3137 nonocast  cwd       DIR                1,4        320            53481396 /Users/nonocast/Library/Containers/com.evernote.Evernote/Data
Evernote 3137 nonocast  txt       REG                1,4   13160208            10194243 /Applications/Evernote.app/Contents/MacOS/Evernote
Evernote 3137 nonocast  txt       REG                1,4      75696             3958353 /Applications/Evernote.app/Contents/Frameworks/wav2gsm.framework/Versions/A/wav2gsm
Evernote 3137 nonocast  txt       REG                1,4     436576             3958322 /Applications/Evernote.app/Contents/Frameworks/HockeySDK.framework/Versions/A/HockeySDK
Evernote 3137 nonocast  txt       REG                1,4     435008             6139516 /Applications/Evernote.app/Contents/Frameworks/CocoaLumberjack.framework/Versions/A/CocoaLumberjack
Evernote 3137 nonocast  txt       REG                1,4      42304            10194134 /Applications/Evernote.app/Contents/Frameworks/ENLogging.framework/Versions/A/ENLogging
Evernote 3137 nonocast  txt       REG                1,4     221152             3958337 /Applications/Evernote.app/Contents/Frameworks/OpenIDAppAuth.framework/Versions/A/OpenIDAppAuth
Evernote 3137 nonocast  txt       REG                1,4    6265584            10194076 /Applications/Evernote.app/Contents/Frameworks/CoreNote.framework/Versions/A/CoreNote
Evernote 3137 nonocast  txt       REG                1,4      86528            10194065 /Applications/Evernote.app/Contents/Frameworks/CommEngine.framework/Versions/A/CommEngine

参考:

• linux 系统监控、诊断工具之 lsof 用法简介 - leejun2005的个人页面 - OSCHINA