topic Re: grep command - help needed in Operating System - HP-UX

grep command - help needed

Anand_30 — Tue, 21 Oct 2003 17:18:53 GMT

Is there any option in grep which helps me to search for a particular pattern and then display 'n' lines after that. I am using
HP-UX10.20. In linux it can be done using
'grep -A n' option.

Thanks,
Andy

Re: grep command - help needed

A. Clay Stephenson — Tue, 21 Oct 2003 17:40:14 GMT

There is no such option in grep. It would be easy to do in awk. There is an extreme reluctance in UNIX (unlike Linux) to 'improve' commands which have literally been around for decades. It tends to make things very unportable.

Re: grep command - help needed

Anand_30 — Tue, 21 Oct 2003 17:59:20 GMT

Thanks,

How do I do it using awk. Can you provide some examples.

-Andy

Re: grep command - help needed

curt larson_1 — Tue, 21 Oct 2003 19:14:28 GMT

cat yourfile |
awk '{
if ( $0 ~ /yourpattern/ ) {
for ( i=0; igetline;
print $0;
}}}'

Re: grep command - help needed

Dave La Mar — Tue, 21 Oct 2003 19:16:39 GMT

Andy -
As much as I would like to see the awk solution as well, this is a technique I have used.
You have the line number to start with from your grep -n so ....
sed -n "$your_line_number","$X_line_numbers_out"p $SCRIPT_HOME/$DATA_FILE > $OUT_FILE

Or let starting_line="$your_line_number + 1"
let ending_line="$your_line_number + 5"
sed -n "$starting_line","$ending_line"p $SCRIPT_HOME/$DATA_FILE > $OUT_FILE

Best of luck.

Regards,

dl

Re: grep command - help needed

H.Merijn Brand (procura — Tue, 21 Oct 2003 19:29:19 GMT

Why not just fetch GNU grep for 10.20 from my site, and you have the same as Linux :)

https://www.beepz.com/personal/merijn/ , http://www.cmve.net/~merijn/ , or or http://www.hpux.ws/merijn/

Enjoy, have FUN! H.Merijn

Re: grep command - help needed

curt larson_1 — Tue, 21 Oct 2003 19:36:29 GMT

have you tried

ex -s +"g/yourpattern/ .+1,.+numberOfLines |q" filename

Re: grep command - help needed

curt larson_1 — Tue, 21 Oct 2003 19:38:37 GMT

oops forgot the p for print

ex -s +"g/yourpattern/ .+1,.+numberOfLines p|q" filename

Re: grep command - help needed

Hein van den Heuvel — Tue, 21 Oct 2003 20:30:11 GMT

Under OpenVMS the command would be:

$SEARCH/WINDOW=(0,)

The 0 being 0 pre-fix lines. Surely you were all dying to know that huh?

In Tru64 you can often use -p for a 'paragraph'. No use there either huh?

I'm a bit dissapointed at the lack of extension in many hpux tools. I like the suggestion of just picking up GNU grep.

In the mean time you coudl use AWK:

awk '//{print $0; i=; while (i--) {getline; print $0}}' <

or PERL (assuring a re-start every occurence:

cat | perl -e 'while (<>){$i= if (//); print if ($i-->0)}'

Re: grep command - help needed

Jack Werner — Thu, 23 Oct 2003 12:25:40 GMT

Andy,

You can still use grep then pipe the stdout to head -n for number of lines to display.

grep file | head -20

Would display the first 20 lines grep returned.

CIAO