(gawk.info.gz) Exit Status

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 2.6 `gawk''s Exit Status
 ========================
 
 If the `exit' statement is used with a value ( Exit Statement),
 then `gawk' exits with the numeric value given to it.
 
    Otherwise, if there were no problems during execution, `gawk' exits
 with the value of the C constant `EXIT_SUCCESS'.  This is usually zero.
 
    If an error occurs, `gawk' exits with the value of the C constant
 `EXIT_FAILURE'.  This is usually one.
 
    If `gawk' exits because of a fatal error, the exit status is 2.  On
 non-POSIX systems, this value may be mapped to `EXIT_FAILURE'.
 

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(gawk.info.gz) Environment Variables

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