Set, setenv or export? Confused between three options

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explain_setenv_or_die

explain_setenv_or_die(3)				     Library Functions Manual					  explain_setenv_or_die(3)

NAME

       explain_setenv_or_die - change or add an environment variable and report errors

SYNOPSIS

       #include <libexplain/setenv.h>
       void explain_setenv_or_die(const char *name, const char *value, int overwrite);
       int explain_setenv_on_error(const char *name, const char *value, int overwrite);

DESCRIPTION

       The explain_setenv_or_die function is used to call the setenv(3) system call. On failure an explanation will be printed to stderr, obtained
       from the explain_setenv(3) function, and then the process terminates by calling exit(EXIT_FAILURE).

       The explain_setenv_on_error function is used to call the setenv(3) system call. On failure  an  explanation  will  be  printed  to  stderr,
       obtained from the explain_setenv(3) function, but still returns to the caller.

       name    The name, exactly as to be passed to the setenv(3) system call.

       value   The value, exactly as to be passed to the setenv(3) system call.

       overwrite
	       The overwrite, exactly as to be passed to the setenv(3) system call.

RETURN VALUE

       The  explain_setenv_or_die  function  only  returns  on	success, see setenv(3) for more information. On failure, prints an explanation and
       exits, it does not return.

       The explain_setenv_on_error function always returns the value return by the wrapped setenv(3) system call.

EXAMPLE

       The explain_setenv_or_die function is intended to be used in a fashion similar to the following example:
	      explain_setenv_or_die(name, value, overwrite);

SEE ALSO

       setenv(3)
	       change or add an environment variable

       explain_setenv(3)
	       explain setenv(3) errors

       exit(2) terminate the calling process

COPYRIGHT

       libexplain version 0.52
       Copyright (C) 2010 Peter Miller

															  explain_setenv_or_die(3)

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