Random linux stuff

I regularly need to filter and modify text output from commands, but when I don’t using them often enough I tend to forget the syntax I used (or why I used it).  This is a collection of command filters as a reminder to me, and may help out others.

Getting the last word in a line – OS:CentOS

>$ echo 'The lazy dog jumped over the quick brown fox.' | sed -e 's/.* //g'
fox.
>$ echo 'The lazy dog jumped over the quick brown fox.' | awk '{print $NF}'
fox.

Both ways work; the second works even if there’s a trailing space.

Need to find a process/port running.  CentOS /usr/sbin/lsof

sudo lsof -Pni | grep snmp
snmpd     31823   snmp   7u  IPv4 3810858  UDP *:161
snmpd     31823   snmp   9u  IPv6 3810863  UDP *:161
snmpd     31823   snmp  10u  IPv4 3810864  TCP *:161 (LISTEN)
snmpd     31823   snmp  11u  IPv6 3810866  TCP *:161 (LISTEN)
snmptrapd 31826   root   8u  IPv4 3810878  UDP *:162
snmptrapd 31826   root   9u  IPv6 3810882  UDP *:162