grep command - help needed

[Anand_30]

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

[A. Clay Stephenson]

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.

[Anand_30]

Thanks,

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

-Andy

[curt larson_1]

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

[Dave La Mar]

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

[H.Merijn Brand (procura]

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

[curt larson_1]

have you tried

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

[curt larson_1]

oops forgot the p for print

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

[Hein van den Heuvel]

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)}'

[Jack Werner]

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