Linux Control Operators

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Linux Control Operators

With the help of control operators you can put more than one command in the command line. It helps in performing a control function.

Use of control operators

Backslash enables control character but without shell interpretation. 

Control Operator Usage
;semicolon More than one command can be used in a singleline.
& ampersand Command ends with & and doesn't wait for command to finish.
$?dollar question mark Used to store exit code of the previous command.
&& double ampersand Used as logical AND.
|| double vertical bar Used as logical OR.
Combining && and || Used to write if then else structure in command line.
# pound sign Anything written after # will be ignored.
escaping special characters