Multi-command execution in ubuntu

Command & amp; command is run in the background of the sub-shell. Background tasks allow multiple programs to run in one shell. ------------------------------------------------------------------ Command1 | command2command1...
Command & command is run in the background of the sub-shell. Background tasks allow multiple programs to run in one shell. ------------------------------------------------------------------ Command1 | the standard output of command2 command1 is directly input to the standard input of command2. Both commands may run in parallel. This is called pipeline. Www.2cto.com ------------------------------------------------------------------ command1; command2 command1command2 is executed in an orderly manner. ------------------------------------------------------------------ Command1 & command2 command1 if the execution is successful, execute command2 again. Only when command1 and command2 run successfully will the above command sequence be returned successfully. ------------------------------------------------------------------ Command1 | after command2 command1 is executed, if it fails, command2 will also be executed. If one of command1 or command2 is successfully executed, the above sequence returns the true value. Author lzyfn123