extract key values

Shell Programming and Scripting
1

I am parsing a log with key values spread all over in the following fashion:

TEST 1 SCHEME 12 SET EMPTY
VARLEN SET TEST 1201 PARAM1 EMTY PARAM2 SET
SCHEME 12 REFRESH TEST 8

I need to extract test number, my result should be

1
1201
8

I use awk for processing this log and use split to search for the values:

n = split($0, a);
for(i = 1; i <= n; i++) {
        if(a == "TEST") {
                value = a[i+1]; 
        }       
}

I suspect my code is not efficient, I thought of using index($0, "TEST") within substr etc.., but my code ended up using two index() calls and this is not the best way either.

Any ideas how to improve the code would be appreciated.

2

grep & regex

grep -o 'TEST [0-9]*' file | cut -d' ' -f2
3

If your grep doesn't support -o option:

sed -n '/TEST [0-9][0-9]*/ s/.*TEST \([0-9][0-9]*\).*/\1/p' file
4

Anchal

The command is good .
can u explain the command?

5 
'/TEST [0-9][0-9]*/

searching for the pattern. TEST<space><one or more digits>

s/.*TEST \([0-9][0-9]*\).*/\1/p'

removing everything but the required numbers from the above matched lines.

\(..\) are used to save the regex/pattern found.
\1 are used to recall the above regex/pattern.

you can have max 9 such recalls.

1 Like