grep for multiple patterns

[Rick Garland]

Hi all:

Quick question on the use of 'grep'

I have a need to do multiple greps of processes from the command line. Each pattern will be different but I have to check for the occurance of any of these patterns.

I have tried
ps -ef | grep a b c d e
Responds that "grep can't open b c d e"

Would I need to do;
ps -ef | grep a | grep b | grep c | grep d
Or is there a better way?

Thanks!

[RAC_1]

Not completely sure on what you want??

ps -ef | grep 'a b c d e'
ps -ef | egrep "a|b|c|d|e"

Anil

[Geoff Wild · Accepted solution]

egrep!

ps -ef |egrep -i 'a|b|c|d'


Rgds...Geoff

[Pete Randall]

Rick,

I think extended regular expressions (ERE) are what you're looking for:

ps -ef |grep -e "a" -e "b" -e "c" -e "d" -e "e"


Pete

[H.Merijn Brand (procura]

# grep -e pat1 -e pat2 -e pat3 file

greps pat1 OR pat2 OR pat3 OR pat5

# grep pat1 file | grep pat2 | grep pat3

greps pat1 AND pat2 AND pat3

# grep -e pat1 -e pat2 file | grep pat3

greps (pat1 OR pat2) AND pat3

# perl -ne'/pat1/||/pat2/||/pat3/and print'

pat1 OR pat2 OR pat3

# perl -ne'(/pat1/||/pat2/)&&/pat3/and print'

(pat1 OR pat2) AND pat3

etc etc ...

Enjoy, Have FUN! H.Merijn

[Rick Garland]

Many thanks all!