reverse search in awk script

id4forum · #1 (**permalink**) 10-09-2008

Hi,

I am new to awk. Actually I want to search a pattern A, when I get that line with pattern A then for one of the field of that line again I want search on that field (say pattern B)from start of the file.
I am using awk. Is nested searching possible in awk?

Please do the needful as soon as possible.

Thanks,

a2156z · #2 (**permalink**) 10-09-2008

I am unsure what do you need the output, line number ? if that, just use grep is ok.
grep -n "$A" "$file_name" | grep "$B" | awk '{print $1}'
Or the filed is specified? if that,
awk '$0~/A/ && $i == B{print NR}' "$file_name"

id4forum · #3 (**permalink**) 10-10-2008

Let me clear my doubt....I am searching for pattern A, once I get that pattern in file I get that entire line and extract its $i field(pattern B) in one variable(its known in advance) and again start search for pattern B from start of the file. I am using awk.

Thanks,

id4forum · #4 (**permalink**) 10-13-2008

Let me clear my doubt....I am searching for pattern A, once I get that pattern in file I take that entire line and extract its $i field(pattern B) in one variable(its not known in advance) and again start search for pattern B from start of the file. I am using awk.

Please suggest something in awk

Thanks,

summer_cherry · #5 (**permalink**) 10-13-2008

search patternA first, when matched, put the $2(assume it contains patternB) in the variable pat, then go through the whole file content and print out all the lines contain patternB

Code:

awk '{
if(index($0,"patternA")!=0)
	pat=$2
arr[NR]=$0
}
END{
for(i in arr)
	if(index(arr[i],pat)!=0)
		print arr[i]
}' filename

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