Shell: Save value in a variable, not the command

Question

I'd like to save my current directory into a value.

I do it like this

dir=`dirname $0`

But when I now change the directory and use this variable, it seems that the expression gets evaluated anew.

Do you know how I can store it's value in the variable, not the expression itself?

Answer 1

This looks ok to me. The expression will not get evaluated every time. Try echo $dir to see the value of the dir variable.