GNU/Linux Command-Line Tools Summary

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6.4. Performing more than one command

• Executing the second command only if the first is successful
   

To do this you would type:


   

command1 && command2

command2 will be executed if command1 successfully completes (if command1 fails command2 won't be run). This is called a logical AND.



• Executing the second command only if the first fails
   

To do this you would type:


   

command1 || command2

command2 will be executed if command1 does not successfully complete (if command1 is successful command2 won't be run). This is called a logical OR.



• Executing commands sequentially
   

To execute commands sequentially regardless of the success/failure of the previous you simply type:


   

command1; command2

command2 will execute once command1 has completed.


       More than two commands
        

You can continue to use ';' (semicolon) characters to do more and more commands on the one line.

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