[SOLVED] awk: search and concatenate string in a single line

Issue

I've a text file with this data

set( VERSION_MAJOR 1 ) 
set( VERSION_MINOR 2 )
set( VERSION_PATCH 3 )

I'm looking to make a string like this and save in a new file.

VERSION 1.2.3

I tried following code,

$ awk  '/VERSION_MAJOR/ {print $3; exit} ' version.txt >> version.in
$ awk  '/VERSION_MINOR/ {print $3; exit} ' version.txt >> version.in
$ awk  '/VERSION_PATCH/ {print $3; exit} ' version.txt >> version.in
$ cat version.in 
1
2
3

As you can see I can search/parse the individual versions, but unable to concatenate them in a single string such as 1.2.3.

How can I do this with awk or sed?

Thank you.

Solution

Assumptions:

• there may be other lines in the file besides the 3x VERSION_ entries
• spacing is exactly as depicted in the example, ie, the desired numbers are in the 3rd space-delimited field

If you find yourself calling awk multiple times chances are pretty good you can do the whole thing with a single awk call; one idea combining OP's current code into a single awk call:

awk '
/VERSION_MAJOR/ { maj=$3 }
/VERSION_MINOR/ { min=$3 }
/VERSION_PATCH/ { pat=$3 } 
END             { printf "VERSION %d.%d.%d\n", maj, min, pat }
' version.txt

This generates:

VERSION 1.2.3

NOTE: if one of the VERSION_ entries is missing then the %d will cause the associated undefined awk variable to display as a 0

Answered By - markp-fuso

Answer Checked By - Dawn Plyler (WPSolving Volunteer)