Bracketing operators in shell wiki

Some bracketing syntax commonly encountered in shell scripts

We have often encountered the following kinds of operators and I have seen people having difficulty in wrapping their head around these. This wiki only discusses the following operators or brackets (whatever)

• (…)
• $(…)
• ((…))
• […]
• [[…]]
• $var
• ${…}

So lets get to them one by one.

• (...) : This indicates a subshell

If you are a beginner and looking to get started, you might want to follow up this simple article, which takes you through make in short A short introduction to GNU make