nawk/grep script for counting occurences on line before

Posted on 09/19/2011 by asoftwareguy

I was helping out a co-worker of mine construct a script to find/count occurrences of a given string that occur on a line preceding another given string. Using GNU grep, this would be easy:

grep -B 1 tofind FILE_PATTERN | grep -c tofindabove

Unfortunately, Solaris does not use GNU grep, so I had to resort to using nawk + grep:

nawk 'c-->0;$0~s{if(b)for(c=b+1;c>1;c--)print r[(NR-c+1)%b];print;c=a}b{r[NR%b]=$0}' b=1 a=0 s="tofind" FILE_PATTERN | grep -c tofindabove

where within the nawk command,
b: number of lines before match to display
a: number of lines after match to display
s: string to match

Credit for the usage of the nawk command in this context.

This entry was posted in Scripting, Solaris and tagged awk, count, count occurences before line, grep, nawk, solaris. Bookmark the permalink.

2 Responses to nawk/grep script for counting occurences on line before

Nadeem Rashid says:

10/13/2011 at 1:31 am

nawk ‘c–>0;$0~s{if(b)for(c=b+1;c>1;c–)print r[(NR-c+1)%b];print;c=a}b{r[NR%b]=$0}’ b=1 a=0 s=”tofind” FILE_PATTERN | grep -c tofindabove

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Nadeem Rashid says:

10/31/2011 at 1:26 pm

grep -i ‘Exception’ Filename | tr -s ‘[ ]’ ‘[ ]’ | tr ‘[ ]’ ‘[\n ]’ | grep -i ‘xception’ | tr -s ‘[\t]’ ‘[\n ]’ | tr -s ‘[[]’ ‘[\n]’ | tr -s ‘[]]’ ‘[\n]’ | tr -s ‘[-]’ ‘[\n]’ | tr -s ‘[>]’ ‘[\n]’ | tr -s ‘[:]’ ‘[\n]’ | tr -s ‘[<]' '[\n]' | tr -s '[ ]' '[\n ]' | grep -i 'xception' | sort | uniq -c | sort -n

try this also for print a pattern matching and count

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