Question

I am trying to search for a text in a file and store it into a variable.

My file looks something like this:

Type: Furniture
Color: Blue
Version: 1

I am trying to search for the Version number and store it into a variable and increment it. This number is unknown to me when I am searching the file. So far I have something like this.

VERSIONNUMBER=//Somehow I want to get the version # from the file. 
VERSIONNUMBER=`expr $VERSIONNUMBER + 1'

sed -i "s/Version:.*/Version=$VERSIONNUMBER/" filename

Am I on the right track so far or is there a better way of doing this? I’m having trouble searching for the version number. I keep getting syntax errors. Any help is much appreciated.

VERSIONNUMBER=`sed -i "s/Version:/*" filename`

Answer 1

This is a job for awk

 awk '/Version:/{$2++}1' ./infile > ./outfile

Example

$ awk '/Version:/{$2++}1' ./infile
Type: Furniture
Color: Blue
Version: 2

Explanation

/Version:/ Match only lines that contain the text ‘Version:’

$2++: Get the 2nd field, of which awk delimits with a space by default, and increment it

{...}1: A shortcut to tell awk to print out the lines after it does any alterations