Shell Programming and Scripting

I have one file data.txt. This data.txt file contain "no of head=3" string.
From a shell script I want to check whether data.txt file contains "no of head" string or not, if yes then want to fetch the value 3 and store it in a variable. Anyone plz help me.

Something like this?

Code:

var=$(awk -F= '$1 == "no of head" { print $2 })
if [[ -n "$var" ]]
then
    echo found value $var
else 
    echo found nothing!
fi

Thanks for reply.

I update your code by putting the file name data.txt.

var=$(awk -F='data.txt' $1 == "no of head" { print $2 })
if [[ -n "$var" ]]
then
echo found value $var
else
echo found nothing!
fi

I receive the below error :

syntax error The source line is 1.
The error context is
>>> == <<<
awk: Quitting
The source line is 1.
found nothing!

Can you plz suggest.

Sorry, I forgot the filename, didn't I. :-) I also forgot the closing quote. Try it like this:

Code:

var=$(awk -F= '$1 == "no of head" { print $2 }' data.txt)
if [[ -n "$var" ]]
then
    echo found value $var
else 
    echo found nothing!
fi

Thanks a lot it's working fine.