topic Re: egrep question in Operating System - HP-UX

egrep question

Allanm — Thu, 17 Mar 2011 00:22:30 GMT

Hi!

I want to egrep for two different words in a single line using egrep.

lets say line is -

allan is a great man

egrep for allan and great in the same line else dont print that line.

Thanks,
Allan.

Re: egrep question

James R. Ferguson — Thu, 17 Mar 2011 00:33:39 GMT

Hi Allan:

If you want and AND relationship where both strings match:

# echo "allan is a great man"|grep allan|grep great

...but if you want an OR (alternation) where only one string need match:

# echo "allan is a great man"|grep -E "allan|great"

Regards!

...JRF...

Re: egrep question

Steven Schweda — Thu, 17 Mar 2011 02:56:43 GMT

> # echo "allan is a great man"|grep allan|grep great

Two "grep" processes? Ptui. Make one
process work harder:

alp$ echo 'allan is a great man' | egrep -e 'allan.*great|great.*allan'
allan is a great man

alp$ echo 'a great man is allan' | egrep -e 'allan.*great|great.*allan'
a great man is allan

As usual, everything's complicated, and the
fine print may matter. Case? Distinct
words, or strings anywhere?

alp$ echo 'greater gallantry' | egrep -e 'allan.*great|great.*allan'
greater gallantry

Of course, if the order is known, then the
regular expression could be simplified.

Re: egrep question

Hein van den Heuvel — Thu, 17 Mar 2011 03:19:08 GMT

Heed Steven's advice.

>> I want to egrep for two different words in a single line using egrep.

Hmmm, why would one feel one should use 'egrep' (fill in any other forcibly chosen tool) if one, apparently, does not know it well enough?

This _might_ be better solved with AWK

$ awk '/allan/ && /great/' your-file.txt

or perl

$ perl -ne 'print if /allan/ && /great/' your-file.txt

more perl, written more silly ...

$ perl -ne '/allan/ && /great/ && print' your-file.txt

fwiw,
Hein.

Re: egrep question

Allanm — Thu, 17 Mar 2011 04:03:47 GMT

great discussion!

Thanks guys

Allan.

Re: egrep question

Dennis Handly — Thu, 17 Mar 2011 06:45:14 GMT

>I want to egrep for two different words in a single line using egrep.

Why would you want to use the egrep hammer if you can use grep instead?

>egrep for allan and great in the same line

You can use this if you don't want a grep pipeline:
grep -e "allan.*great" -e "great.*allan"