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'''Command substitution''' is a facility that allows a command<br>to be run and its output to be pasted back on the command line as arguments to another command.<br>Reference: https://en.wikipedia.org/wiki/Command_substitution<br><br>
''Usage:''
<span style="font-family:courier"><b>command1 $(command2)</b><br>or<br><b>command1 `command2`</b></span><br><br>
''Examples:''
<span style="font-family:courier;font-weight:bold">file $(ls)<br>mail -s "message" $(cat email-list.txt)< message.txt<br><br><br>
