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 completes (if command1 is successful command2 won't be run). This is called a logical OR.
Executing commands sequentially
To execute command sequentially regardless of the success/failure of the previous you simply type: command1; command2
command2 will execute once command1 has completed.
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source:http://linuxpoison.blogspot.com/2008/04/13578175809888.html