To get Port number alone from the list


 
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Top Forums Shell Programming and Scripting To get Port number alone from the list
# 8  
Old 03-31-2011
Quote:
Originally Posted by michaelrozar17
Another idea through sed..
Code:
netstat -vatn | sed -n '/LISTEN/s/.*:\([0-9]\+\) .*/\1/p'

GNU sed to be specific. \+ is an extension to posix, under which that sequence is undefined.

Regards,
Alister
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UNLISTEN(7)						  PostgreSQL 9.2.7 Documentation					       UNLISTEN(7)

NAME
UNLISTEN - stop listening for a notification SYNOPSIS
UNLISTEN { channel | * } DESCRIPTION
UNLISTEN is used to remove an existing registration for NOTIFY events. UNLISTEN cancels any existing registration of the current PostgreSQL session as a listener on the notification channel named channel. The special wildcard * cancels all listener registrations for the current session. NOTIFY(7) contains a more extensive discussion of the use of LISTEN and NOTIFY. PARAMETERS
channel Name of a notification channel (any identifier). * All current listen registrations for this session are cleared. NOTES
You can unlisten something you were not listening for; no warning or error will appear. At the end of each session, UNLISTEN * is automatically executed. A transaction that has executed UNLISTEN cannot be prepared for two-phase commit. EXAMPLES
To make a registration: LISTEN virtual; NOTIFY virtual; Asynchronous notification "virtual" received from server process with PID 8448. Once UNLISTEN has been executed, further NOTIFY messages will be ignored: UNLISTEN virtual; NOTIFY virtual; -- no NOTIFY event is received COMPATIBILITY
There is no UNLISTEN command in the SQL standard. SEE ALSO
LISTEN(7), NOTIFY(7) PostgreSQL 9.2.7 2014-02-17 UNLISTEN(7)