10 lsof command examples in linux.pdf
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init 1 root 2u CHR 1,3 0t0 3764 /dev/null
init 1 root 3r FIFO 0,8 0t0 8449 pipe
init 1 root 4w FIFO 0,8 0t0 8449 pipe
init 1 root 5r DIR 0,10 0 1 inotify
init 1 root 6r DIR 0,10 0 1 inotify
init 1 root 7u unix 0xc1513880 0t0 8450 socket
Sections and its values are self-explanatory. However, well review FD & TYPE columns more precisely.
FD stands for File descriptor and may seen some of the values as:
1. cwd current working directory
2. rtd root directory
3. txt program text (code and data)
4. mem memory-mapped file
Also in FD column numbers like 1u is actual file descriptor and followed by u,r,w of its mode as:
1. r for read access.2. w for write access.
3. u for read and write access.
TYPE of files and its identification.
1. DIR Directory
2. REG Regular file
3. CHR Character special file.
4. FIFO First In First Out
2. List User Specific Opened Files
The below command will display the list of all opened files of usertecmint.
# lsof -u tecmint
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
sshd 1838 tecmint cwd DIR 253,0 4096 2 /
sshd 1838 tecmint rtd DIR 253,0 4096 2 /
sshd 1838 tecmint txt REG 253,0 532336 188129 /usr/sbin/sshd
sshd 1838 tecmint mem REG 253,0 19784 190237 /lib/libdl-2.12.so
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sshd 1838 tecmint mem REG 253,0 122436 190247 /lib/libselinux.so.1
sshd 1838 tecmint mem REG 253,0 255968 190256 /lib/libgssapi_krb5.so.2.2
sshd 1838 tecmint mem REG 253,0 874580 190255 /lib/libkrb5.so.3.3
3. Find Processe s running on Specific Port
To find out all the running process of specific port, just use the following command with option -i. The below example will list all running process of port 22.
# lsof -i TCP:22
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
sshd 1471 root 3u IPv4 12683 0t0 TCP *:ssh (LISTEN)
sshd 1471 root 4u IPv6 12685 0t0 TCP *:ssh (LISTEN)
4. List Only IPv4 & IPv6 Open Files
In below example shows only IPv4 and IPv6 network files open with separate commands.
# lsof -i 4
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
rpcbind 1203 rpc 6u IPv4 11326 0t0 UDP *:sunrpc
rpcbind 1203 rpc 7u IPv4 11330 0t0 UDP *:954
rpcbind 1203 rpc 8u IPv4 11331 0t0 TCP *:sunrpc (LISTEN)
avahi-dae 1241 avahi 13u IPv4 11579 0t0 UDP *:mdns
avahi-dae 1241 avahi 14u IPv4 11580 0t0 UDP *:58600
# lsof -i 6
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAMErpcbind 1203 rpc 9u IPv6 11333 0t0 UDP *:sunrpc
rpcbind 1203 rpc 10u IPv6 11335 0t0 UDP *:954
rpcbind 1203 rpc 11u IPv6 11336 0t0 TCP *:sunrpc (LISTEN)
rpc.statd 1277 rpcuser 10u IPv6 11858 0t0 UDP *:55800
rpc.statd 1277 rpcuser 11u IPv6 11862 0t0 TCP *:56428 (LISTEN)
cupsd 1346 root 6u IPv6 12112 0t0 TCP localhost:ipp (LISTEN)
5. List Open Files of TCP Port ranges 1-1024
To list all the running process of open files ofTCP Port ranges from 1-1024.
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# lsof -i TCP:1-1024
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
rpcbind 1203 rpc 11u IPv6 11336 0t0 TCP *:sunrpc (LISTEN)
cupsd 1346 root 7u IPv4 12113 0t0 TCP localhost:ipp (LISTEN)
sshd 1471 root 4u IPv6 12685 0t0 TCP *:ssh (LISTEN)
master 1551 root 13u IPv6 12898 0t0 TCP localhost:smtp (LISTEN)
sshd 1834 root 3r IPv4 15101 0t0 TCP 192.168.0.2:ssh->192.168.0.1:conclave-cpp (ESTABLISHED)
sshd 1838 tecmint 3u IPv4 15101 0t0 TCP 192.168.0.2:ssh->192.168.0.1:conclave-cpp (ESTABLISHED)
sshd 1871 root 3r IPv4 15842 0t0 TCP 192.168.0.2:ssh->192.168.0.1:groove (ESTABLISHED)
httpd 1918 root 5u IPv6 15991 0t0 TCP *:http (LISTEN)
httpd 1918 root 7u IPv6 15995 0t0 TCP *:https (LISTEN)
6. Exclude User with ^ Character
Here, we have excluded root user. You can exclude a particular user using ^ with command as shown above.
# lsof -i -u^root
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
rpcbind 1203 rpc 6u IPv4 11326 0t0 UDP *:sunrpc
rpcbind 1203 rpc 7u IPv4 11330 0t0 UDP *:954
rpcbind 1203 rpc 8u IPv4 11331 0t0 TCP *:sunrpc (LISTEN)
rpcbind 1203 rpc 9u IPv6 11333 0t0 UDP *:sunrpc
rpcbind 1203 rpc 10u IPv6 11335 0t0 UDP *:954
rpcbind 1203 rpc 11u IPv6 11336 0t0 TCP *:sunrpc (LISTEN)
avahi-dae 1241 avahi 13u IPv4 11579 0t0 UDP *:mdns
avahi-dae 1241 avahi 14u IPv4 11580 0t0 UDP *:58600
rpc.statd 1277 rpcuser 5r IPv4 11836 0t0 UDP *:soap-beep
rpc.statd 1277 rpcuser 8u IPv4 11850 0t0 UDP *:55146
rpc.statd 1277 rpcuser 9u IPv4 11854 0t0 TCP *:32981 (LISTEN)rpc.statd 1277 rpcuser 10u IPv6 11858 0t0 UDP *:55800
rpc.statd 1277 rpcuser 11u IPv6 11862 0t0 TCP *:56428 (LISTEN)
7. Find Out whos Looking What Files and Commands?
Below example shows usertecmint is using command like ping and /etc directory .
# lsof -i -u tecmint
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAMEbash 1839 tecmint cwd DIR 253,0 12288 15 /etc
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ping 2525 tecmint cwd DIR 253,0 12288 15 /etc
8. List all Network Connections
The following command with option -i shows the list of all network connections LISTENING & ESTABLISHED.
# lsof -i
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
rpcbind 1203 rpc 6u IPv4 11326 0t0 UDP *:sunrpc
rpcbind 1203 rpc 7u IPv4 11330 0t0 UDP *:954
rpcbind 1203 rpc 11u IPv6 11336 0t0 TCP *:sunrpc (LISTEN)
avahi-dae 1241 avahi 13u IPv4 11579 0t0 UDP *:mdns
avahi-dae 1241 avahi 14u IPv4 11580 0t0 UDP *:58600
rpc.statd 1277 rpcuser 11u IPv6 11862 0t0 TCP *:56428 (LISTEN)
cupsd 1346 root 6u IPv6 12112 0t0 TCP localhost:ipp (LISTEN)
cupsd 1346 root 7u IPv4 12113 0t0 TCP localhost:ipp (LISTEN)
sshd 1471 root 3u IPv4 12683 0t0 TCP *:ssh (LISTEN)
master 1551 root 12u IPv4 12896 0t0 TCP localhost:smtp (LISTEN)
master 1551 root 13u IPv6 12898 0t0 TCP localhost:smtp (LISTEN)
sshd 1834 root 3r IPv4 15101 0t0 TCP 192.168.0.2:ssh->192.168.0.1:conclave-cpp (ESTABLISHED)
httpd 1918 root 5u IPv6 15991 0t0 TCP *:http (LISTEN)
httpd 1918 root 7u IPv6 15995 0t0 TCP *:https (LISTEN)
clock-app 2362 narad 21u IPv4 22591 0t0 TCP 192.168.0.2:45284->www.gov.com:http (CLOSE_WAIT)
chrome 2377 narad 61u IPv4 25862 0t0 TCP 192.168.0.2:33358->maa03s04-in-f3.1e100.net:http (ESTABLISHED)
chrome 2377 narad 80u IPv4 25866 0t0 TCP 192.168.0.2:36405->bom03s01-in-f15.1e100.net:http (ESTABLISHED)
9. Search by PID
The below example only shows whose PID is 1 [One].
# lsof -p 1
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
init 1 root cwd DIR 253,0 4096 2 /
init 1 root rtd DIR 253,0 4096 2 /
init 1 root txt REG 253,0 145180 147164 /sbin/init
init 1 root mem REG 253,0 1889704 190149 /lib/libc-2.12.so
init 1 root mem REG 253,0 142472 189970 /lib/ld-2.12.so
10. Kill all Activity of Particular User
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Bio Latest Posts
Sometimes you may have to kill all the processes for a specific user. Below command will kills all the processes oftecmint user.
# kill -9 `lsof -t -u tecmint`
Note: Here, its not possible to give example of all available options, this guide is only to show how lsofcommand can be use. You may refer man page of
lsofcommand to know more about it. Please share it if you find this article is useful through our comment box below.
Narad Shrestha
He has over 10 years of rich IT experience which includes various Linux Distros, FOSS and Networking. Narad always believes sharing
IT knowledge with others and adopts new technology with ease.
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