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find a word and print n lines before and after the match

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# 8  
Old 12-09-2011
sorry..its not working
it says illegal option -A
# 9  
Old 12-09-2011
Hi.

The standard grep and xpg4/ grep do not admit -A -B options, at least on:
Code:
OS, ker|rel, machine: SunOS, 5.10, i86pc
Distribution        : Solaris 10 10/08 s10x_u6wos_07b X86

In addition, the OP appears to looking for bounding lines that are not the result of a count, but rather a pattern -- a blank line in this case.

One solution is cgrep, but one needs to obtain the source and compile it. I did that and keep it in a local directory. Here is a sample showing how it works on Linux:
Code:
#!/usr/bin/env bash

# @(#) s1	Demonstrate extract blank-line-bounded block, cgrep.
# http://sourceforge.net/projects/cgrep/

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C

FILE=${1-data1}

pl " Input data file $FILE:"
cat $FILE

pl " Results:"
cgrep -D +-w "^$" -e "B" $FILE

exit 0

producing:
Code:
% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.26-2-amd64, x86_64
Distribution        : Debian GNU/Linux 5.0.8 (lenny) 
GNU bash 3.2.39

-----
 Input data file data1:
G
M

A
B
C
D

E
F

X
B
Z




-----
 Results:

A
B
C
D


X
B
Z

If you could get by with -A and -B, there are alternatives:
Code:
ack - grep-like text finder, a perl code
http://betterthangrep.com/

Code:
glark - Search text files for complex regular expressions, a ruby code
http://www.incava.org/projects/glark/

Best wishes ... cheers, drl
This User Gave Thanks to drl For This Post:
chidori
# 10  
Old 12-09-2011
is there any other way.. like awk or perl .. i was hoping this can be done with a oneliner Smilie
# 11  
Old 12-09-2011
look into this thread.
This User Gave Thanks to vgersh99 For This Post:
chidori
# 12  
Old 12-09-2011
That works but in my case the creteria is blank line.. the extraction of lines both above and below the pattern should end when it encounters blank line..
# 13  
Old 12-09-2011
given myFile:
Code:
G
M

A
B
C
D

E
F

nawk '/B/' RS= myFile produces:
Code:
A
B
C
D

These 2 Users Gave Thanks to vgersh99 For This Post:
chidori drl
# 14  
Old 12-09-2011
awesome!!! i nvr thought the one liner would be so simple.. thanks a ton Smilie
so here the record separator is blank line thats why you have give RS=

is that so ?
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