The dumbest of dumb Text Search questions

J.T. · #1 (**permalink**) 11-20-2008

I've done some due diligence by searching the forum for an answer, but to no avail. Excuse this most elementary of questions.

Using grep I can search a file and derive the line number of the text I'm searching for. Now for the elementary part, how do I continue a search for a different search criteria from that line to the end of the file?

Thanks in advance.

joeyg · #2 (**permalink**) 11-20-2008

Show the initial file.
Create a duplicate with line numbers.
Set variable mline equal to first occurence of ABC.
Echo variable $mline.
Use awk to find line number > 3 (value of ml) and the word blah.
Note that I did not find the earler blah entries.

[I believe with awk, a couple of those steps could be skipped by utilizing the record number parameter.]

Code:

> cat file73
blah
blah
ABC
123
456
789
DEF
yech
yech
blah
blah

> cat -n file73 >file73.n
> mline=$(grep -n ABC file73 | head -1 | cut -d":" -f1)
> echo $mline
3
> awk -v ml=$mline '$1>ml && $2=="blah" {print}' file73.n
    10  blah
    11  blah

J.T. · #3 (**permalink**) 11-20-2008

Thanks Joey for your response.

One additional question if you would, how would I then assign the value from the awk statement to a variable for later use in my script ?

J.T. · #4 (**permalink**) 11-20-2008

I was able to assign the results of the awk statement to a variable, but it looks like the supplied code only returns a result if the 2nd search criteria (blah) is in the 1st column. If the 2nd search criteria is not in the 1st column as follows, nothing is returned:

Code:

 
blah
blah
ABC
123
456
789
DEF
yech
yech
GHI blah
JKL blah

How do I modify this logic to search beyond the 1st coumn?

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