1 1 3.2 Shell Commands 1 ================== 1 1 A simple shell command such as 'echo a b c' consists of the command 1 itself followed by arguments, separated by spaces. 1 1 More complex shell commands are composed of simple commands arranged 1 together in a variety of ways: in a pipeline in which the output of one 1 command becomes the input of a second, in a loop or conditional 1 construct, or in some other grouping. 1
1 · Simple Commands The most common type of command. · Pipelines Connecting the input and output of several 1 commands. · Lists How to execute commands sequentially. · Compound Commands Shell commands for control flow. · Coprocesses Two-way communication between commands. · GNU Parallel Running commands in parallel. 1