Very Computer

by **ngk** » Fri, 02 Nov 2001 16:14:09

Hi,
I have a question.
For UNIX System, how can I know the process locked port?
If I want to know which process control port, what command is
used?

by **Michael Heimin** » Fri, 02 Nov 2001 18:53:40

>> Hi,
>> I have a question.
>> For UNIX System, how can I know the process locked port?
>> If I want to know which process control port, what command is
>> used?

> There isn't a command that will tell you which process has a port
> open but there is a freeware program you can download called lsof
> (list of
> open files). Try ftp://vic.cc.purdue.edu/pub/tools/unix/lsof/

netstat can do this, however, it depends on your netstat version, how
usefull the output may be.

# netstat -V
net-tools 1.60
netstat 1.42 (2001-04-15)
Fred Baumgarten, Alan Cox, Bernd Eckenfels, Phil Blundell, Tuan Hoang
and others
+NEW_ADDRT +RTF_IRTT +RTF_REJECT +FW_MASQUERADE +I18N
AF: (inet) +UNIX +INET +INET6 +IPX +AX25 +NETROM +X25 +ATALK -ECONET
-ROSE
HW: +ETHER +ARC +SLIP +PPP +TUNNEL +TR +AX25 +NETROM +X25 +FR -ROSE
-ASH +SIT +FDDI +HIPPI -HDLC/LAPB

Michael Heiming

by **Dragan Cvetkovi** » Sat, 03 Nov 2001 01:08:59

> netstat can do this, however, it depends on your netstat version, how
> usefull the output may be.

> # netstat -V
> net-tools 1.60
> netstat 1.42 (2001-04-15)
> Fred Baumgarten, Alan Cox, Bernd Eckenfels, Phil Blundell, Tuan Hoang
> and others
> +NEW_ADDRT +RTF_IRTT +RTF_REJECT +FW_MASQUERADE +I18N
> AF: (inet) +UNIX +INET +INET6 +IPX +AX25 +NETROM +X25 +ATALK -ECONET
> -ROSE
> HW: +ETHER +ARC +SLIP +PPP +TUNNEL +TR +AX25 +NETROM +X25 +FR -ROSE
> -ASH +SIT +FDDI +HIPPI -HDLC/LAPB

Let's see:
$ netstat -V
netstat: illegal option -- V
usage: netstat [-anv] [-f address_family]
netstat [-g | -p | -s] [-n] [-f address_family] [-P protocol]
netstat -m
netstat -i [-I interface] [-an] [-f address_family] [interval]
netstat -r [-anv] [-f address_family]
netstat -M [-ns] [-f address_family]
netstat -D [-I interface] [-f address_family]
$ which netstat
netstat is /bin/netstat
$ uname -vr
SunOS 5.8

I would say that netstat you were talking about is Linux specific so it
seems that lsof is the answer.

Bye, Dragan

--
Dragan Cvetkovic,

To be or not to be is true. G. Boole

by **Michael Heimin** » Sat, 03 Nov 2001 02:53:47

November 2001 17:08:

>> netstat can do this, however, it depends on your netstat version,
>> how usefull the output may be.

>> # netstat -V
>> net-tools 1.60
>> netstat 1.42 (2001-04-15)
>> Fred Baumgarten, Alan Cox, Bernd Eckenfels, Phil Blundell, Tuan
>> Hoang and others
>> +NEW_ADDRT +RTF_IRTT +RTF_REJECT +FW_MASQUERADE +I18N
>> AF: (inet) +UNIX +INET +INET6 +IPX +AX25 +NETROM +X25 +ATALK
>> -ECONET -ROSE
>> HW: +ETHER +ARC +SLIP +PPP +TUNNEL +TR +AX25 +NETROM +X25 +FR
>> -ROSE -ASH +SIT +FDDI +HIPPI -HDLC/LAPB

> Let's see:
> $ netstat -V
> netstat: illegal option -- V
> usage: netstat [-anv] [-f address_family]
> netstat [-g | -p | -s] [-n] [-f address_family] [-P protocol]
> netstat -m
> netstat -i [-I interface] [-an] [-f address_family]
> [interval] netstat -r [-anv] [-f address_family]
> netstat -M [-ns] [-f address_family]
> netstat -D [-I interface] [-f address_family]
> $ which netstat
> netstat is /bin/netstat
> $ uname -vr
> SunOS 5.8

> I would say that netstat you were talking about is Linux specific so
> it seems that lsof is the answer.

> Bye, Dragan

#netstat -an | grep 25
tcp 0 0 *:25 *:* LISTEN

#grep 25 /etc/services
smtp 25/tcp mail

#uname -a
OSF1 <hostname> V4.0 alpha

Looks like an additional 'ps -ef' should verify that sendmail has
bound to port 25. Solaris should behave equal, even if it's easier
with Linux, you can use 'netstat'.
Sure 'lsof -i tcp:25' would be faster, but it's not standart on most
systems.

Michael Heiming

Very Computer

Q:>I want to know process that locked port

Q:>I want to know process that locked port

Q:>I want to know process that locked port

Q:>I want to know process that locked port

Q:>I want to know process that locked port