It’s quite easy to get bash to concatenate strings and do simple math on Linux, but there are a number of options for you to use. This post focusses on concatenating strings, but also shows how one of the operators (+=) also plays a primary role in incrementing numbers.
In general, the only time that you’d want to concatenate strings on Linux is when one string is already defined and you want to add more to it. For example, if you have a script that greets the person running it, you might set up a string in the script to prepare the greeting and then add the person’s username or name before displaying it.
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Source:: Network World – Data Center