[SOLVED] PS Question

[nmaxwell2006]

Hey All,

So I was curious why I was having trouble with this command while on a RHEL server the other day.
*Running ps with the U Flag*
-bash-2.05b$ ps aux | grep snmpd | grep -v grep
-bash-2.05b$
-bash-2.05b$ which snmpd
-bash-2.05b$ whereis snmpd
snmpd: /usr/local/man/man1/snmpd.1

(NOtice this command did not return the process)

*running ps without the u flag*

-bash-2.05b$ ps ax | grep snmpd | grep -v grep
74952 p1- R 254:22.46 /usr/local/sbin/snmpd
-bash-2.05b$ ps ax | grep snmpd | grep -v grep
74952 p1- R 254:30.13 /usr/local/sbin/snmpd
-bash-2.05b$ ps -aux | grep snmpd | grep -v grep
-bash-2.05b$


(Notice this option returned the running process. )

Why would the U flag not return the snmpd process?

Thanks.

[Rubberman]

Because on Linux the U option requires a user list and will only return the processes that belong to members of the list. It is not the same a the U option for Solaris and other legacy Unix systems.

[nmaxwell2006]

Thanks!

That makes sense.