Also please consider the following text from Wikipædia : > The parent and the child can have an understanding about the meaning > of the exit statuses. For example, it is common programming practice > for a child process to return zero to the parent signifying success. > Apart from this return value from the child, other information like > how the process exited, either normally or by a signal may also be > available to the parent process. > > The specific set of codes returned is unique to the program that sets > it. Typically it indicates success or failure. The value of the code > returned by the function or program may indicate a specific cause of > failure. On many systems, the higher the value, the more severe the > cause of the error.[1] Alternatively, each bit may indicate a > different condition, which are then ored together to give the final > value; for example, fsck does this. > > Sometimes, if the codes are designed with this purpose in mind, they > can be used directly as a branch index upon return to the initiating > program to avoid additional tests.
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