Which process is using which port

[Adwait]

In HPUX, if I want to know which process is using port=4000, then how do I get this information.

[Steven E. Protter]

Shalom,

Best bet is to install lsof.

losf is found.

http://hpux.cs.utah.edu/hppd/hpux/Sysadmin/lsof-4.78/

SEP

[Robert-Jan Goossens]

Hi,

Lsof is usefull tool.

http://hpux.connect.org.uk/hppd/hpux/Sysadmin/lsof-4.78/

# lsof -i tcp:4000

Regards,
Robvert-Jan

[Adwait]

Thanks guys, but is there any other way, since I do not have lsof tool installed on the servers.

[A. Clay Stephenson]

You can use netstat to determine that a given port is in use on a box but that doesn't tell you anything about which process is using the port. Lsof is the tool for this and it's one of those tools that should be installed on every UNIX box. The installation is very easy.

[Robert-Jan Goossens]

It is one of those basic tools you should install on all your servers.

You can try netstat, but there is a change netstat will only report that the port is in use.

# netstat -an | grep 4000

example below.

# netstat -an | grep 65154
tcp4 0 0 *.65154 *.* LISTEN
# lsof -i tcp:65154
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
java 430100 was 255u IPv4 0xf100020003cc3390 0t0 TCP *:65154 (LISTEN)

Regards,
Robert-Jan

[Torsten.]

There is nothing better than lsof!

Example for port 2301:

# lsof -i :2301
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
smhstartd 2270 root 3u IPv4 0x2970880 0t0 TCP *:2301 (LISTEN)


Download and install this tool.

[Jeeshan]

You can do the followings

1. Check the /etc/services file to see which for which service which port are used.
2. netstat -an|grep 4000
3. or you can do lsof.