topic Re: Script "Pattern matching help" in Operating System - HP-UX

Script "Pattern matching help"

Prashant Zanwar_4 — Tue, 30 Nov 2004 10:52:10 GMT

I have a file having following contents:

Hostname:
Comments:

This may contain several lines arranged in fashion as given above.

I want to grab those hosts having development in comment field.

If I try doing it using egrep, Hostname line is anyways getting included even if it is not development box. What can be the turn around. I appreciate all your help.

Thanks
Prashant

Re: Script "Pattern matching help"

Pete Randall — Tue, 30 Nov 2004 11:05:42 GMT

Prashant,

You could adapt this hint from "Handy One Liners for Sed" (attached):

# print 1 line of context before and after regexp, with line number
# indicating where the regexp occurred (similar to "grep -A1 -B1")
sed -n -e '/regexp/{=;x;1!p;g;$!N;p;D;}' -e h

Pete

Re: Script "Pattern matching help"

Rodney Hills — Tue, 30 Nov 2004 11:09:55 GMT

How about "awk"-

awk '/^Hostname/{h=$0};/^Comments: Devel/{print h}' yourfile

HTH

-- Rod Hills

Re: Script "Pattern matching help"

Prashant Zanwar_4 — Tue, 30 Nov 2004 15:15:49 GMT

That was great. I have did it using sed. Just nice.

Thanks and regards
Prashant

Re: Script "Pattern matching help"

Tim D Fulford — Tue, 30 Nov 2004 15:57:19 GMT

perl is also an option

perl -ane 'if (m/Hostname/) {$hst="@F"}; if (m/Comments: Development/) {print "$hst \n"}' file

Just another way of doing the same in a funkier/newer language.

Redards