Pipe

Related terms

• File descriptor — A small integer a process uses to refer to an open file, pipe or socket. 0, 1 and 2 are stdin, stdout and stderr; shell redirects rewire them.
• Exit status — The number a command returns when it ends; 0 means success and anything else means failure. The shell exposes it as `$?` and uses it in `&&`, `||` and `if`.

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