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how to get surrounding lines of grep result

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# 1  
Old 07-19-2008
how to get surrounding lines of grep result
hi,

if i have a file and i want to search for the word error using grep, i usually want to see the surrounding lines too as they contain info about the error. what would be a nice way to achieve this?

thanks
# 2  
Old 07-19-2008
Use the -A and -B option of grep.

Regards
# 3  
Old 07-20-2008
oops, I missed those. thanks
# 4  
Old 07-22-2008
Hi,

my grep on HP-UX does not have this -A and -B option Smilie

my grep is HP-UX 11i Version 2: August 2003

Is there any other way to achieve what I want to do?

thanks
# 5  
Old 07-22-2008
Tools without seeing an example
sometimes you can

Code:
sed "s/good data/good data+/"
tr "\n" "~"
tr "+" "\n"
grep for what you need
tr "~" "\n"

Assuming the end of previous entry is with "good data". I put a plus sign there so I can later force the new-line back.
grep for what I need, and pipe the output through another tr to get my new-line characters back.
# 6  
Old 07-22-2008
Hi.

There are awk and perl solutions in the thread grep and display few lines before and after

I tried them both and they work. The perl solution is far longer, but more general.

An interesting and powerful utility is found at cgrep home page referred to from freshmeat.net: Project details for cgrep but will require some work to configure and compile the c code of the project:
Quote:
DESCRIPTION
cgrep provides all the features of grep, egrep, and fgrep, with greatly
enhanced performance (see the section on PERFORMANCE) along with many
additional features, one of which is the ability to output the context
(surrounding lines) of the matching lines. The use of cgrep is upward-
compatible with that of grep, egrep (using the -E option), or fgrep
(using the -F option).

-- excerpt from man cgrep
... cheers, drl
# 7  
Old 07-23-2008
thanks all
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