(sharutils.info)unshar exit status

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2.2.9 unshar exit status
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One of the following exit values will be returned:
`0 (EXIT_SUCCESS)'
     Successful program execution.

`1 (EXIT_FAILURE)'
     There was an error in command usage.

`2 (EXIT_POPEN_PROBLEM)'
     cannot spawn or write to a shell process

`3 (EXIT_CANNOT_CREATE)'
     cannot create output file

`4 (EXIT_BAD_DIRECTORY)'
     the working directory structure is invalid

`5 (EXIT_NOMEM)'
     memory allocation failure

`6 (EXIT_INVALID)'
     invalid input, does not contain a shar file

`66 (EX_NOINPUT)'
     A specified configuration file could not be loaded.

`70 (EX_SOFTWARE)'
     libopts had an internal operational error.  Please report it to
     autogen-users@lists.sourceforge.net.  Thank you.