Linux shell programming string compare syntax

Question

What is the difference between = and == to compare strings in Linux shell programming?

Maybe the following code works:

if [ \"$         


        

Answer 1

These pages explain the various comparison operators in bash:

• http://www.tech-recipes.com/rx/209/bournebash-shell-scripts-string-comparison/
• http://tldp.org/LDP/abs/html/comparison-ops.html
• http://www.faqs.org/docs/Linux-HOWTO/Bash-Prog-Intro-HOWTO.html#ss11.2

On the second linked page, you will find:

==

    is equal to

    if [ "$a" == "$b" ]

    This is a synonym for =.