How to store the value of cat command in the variable var?

Question

I'm trying to find the number of times a string is repeated in a file, at the same time i've to store it in a variable.

When i use the command (cat filename | grep -c '123456789') , it displays the count correctly but when i use the below command it shows as command not found.

var =$(cat filename | grep -c '123456789')
echo $var

Can u let me know where i'm wrong ?

Answer 1

Don't use spaces around the = sign:

var=$(cat filename | grep -c '123456789')

Read at least the Bash Prog Intro Howto

But you've got a useless use of cat so code simply

    var=$(grep -c '123456789' filename)