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# 1  
Old 08-31-2010
grep
HI
How to search a line before certain string pattern
suppose i have a file
Code:
>  sys 11954 c Sat Aug 28 05:15:00 2010
<  sys 11954 c Sat Aug 28 05:15:02 2010
>  CMD: /clocal/rcc/user/dgircc/bin/appcontext/dcClearAppContext.ksh PROD

how can i get the line before the string
Code:
"/clocal/rcc/user/dgircc/bin/appcontext/dcClearAppContext.ksh PROD"

Last edited by Franklin52; 08-31-2010 at 05:05 AM.. Reason: Please use code tags, thank you!
# 2  
Old 08-31-2010
If you're using GNU grep, you can use:
Code:
grep -B NUM

where NUM is the amount of lines to get 'B'efore the match.
Last edited by Franklin52; 08-31-2010 at 05:06 AM.. Reason: Please use code tags, thank you!
# 3  
Old 08-31-2010
Otherwise, try:
Code:
sed -n '/\/clocal\/rcc\/user\/dgircc\/bin\/appcontext\/dcClearAppContext.ksh PROD/{g;1!p;};h' infile

Code:
awk '$0~"/clocal/rcc/user/dgircc/bin/appcontext/dcClearAppContext.ksh PROD"{print p};{p=$0}' infile

# 4  
Old 08-31-2010
Hi
what is the syntax for GNU grep
when ia giving
Code:
grep -B 2 "/clocal/rcc/user/dgircc/bin/appcontext/dcClearAppContext.ksh TEST" cron_log

it is throwing error
Code:
grep: illegal option -- B
Usage: grep -hblcnsviw pattern file . . .



---------- Post updated at 03:13 PM ---------- Previous update was at 03:08 PM ----------

i got output as
Code:
awk: syntax error near line 1
awk: bailing out near line 1

for
Code:
'$0~"/clocal/rcc/user/dgircc/bin/appcontext/dcClearAppContext.ksh PROD"{print p};{p=$0}' infile
bash-3.00$ awk '$0~"/clocal/rcc/user/dgircc/bin/appcontext/dcClearAppContext.ksh PROD"{print p};{p=$0}' cron_log

and for sed
Code:
sed -n '/\/clocal\/rcc\/user\/dgircc\/bin\/appcontext\/dcClearAppContext.ksh PROD/{g;1!p;};h' cron_log

it is giving blank output
Last edited by Scott; 08-31-2010 at 06:57 AM.. Reason: Code tags, please...
# 5  
Old 08-31-2010
Are you on Solaris? If so, use nawk or /usr/xpg4/bin/awk instead of awk and/or /usr/xpg4/bin/sed instead of sed.
The grep error message shows that the grep you are using is not GNU grep. It probably is not installed on your system.
# 6  
Old 08-31-2010
If indeed on Solaris, and you still want to go the grep route, you may have the Optional software packages installed in /usr/sfw/bin.

In which case, you can find probably: /usr/sfw/bin/ggrep

This should be GNU grep.

HTH
# 7  
Old 08-31-2010
Perl solution:

Code:
$
$
$ cat f1
>  sys 11954 c Sat Aug 28 05:15:00 2010
<  sys 11954 c Sat Aug 28 05:15:02 2010
>  CMD: /clocal/rcc/user/dgircc/bin/appcontext/dcClearAppContext.ksh PROD
$
$
$ perl -lne 'm{/clocal/rcc/user/dgircc/bin/appcontext/dcClearAppContext.ksh PROD} && print $p; $p=$_' f1
<  sys 11954 c Sat Aug 28 05:15:02 2010
$
$

tyler_durden
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