Warum halten sich manche nicht daran ?

-   [Exit and Exit Status](http://tldp.org/LDP/abs/html/exit-status.html)

> Every command returns an exit status (sometimes referred to as a return status or exit code). A successful command returns a 0, while an unsuccessful one returns a non-zero value that usually can be interpreted as an error code. Well-behaved UNIX commands, programs, and utilities return a 0 exit code upon successful completion, though there are some exceptions.

**Every command returns an exit status (sometimes referred to as a return status or exit code).**
Ja, verdammt das sollte immer so sein...

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