program_invocation_name, program_invocation_short_name - obtain name used to invoke calling program
program_invocation_name contains the name that was used to
invoke the calling program. This is the same as the value of
main(), with the difference that the scope
program_invocation_name is global.
program_invocation_short_name contains the basename
component of name that was used to invoke the calling program. That is,
it is the same value as
program_invocation_name, with all text
up to and including the final slash (/), if any, removed.
These variables are automatically initialized by the glibc run-time startup code.
These variables are GNU extensions, and should not be used in programs intended to be portable.
/proc/[number]/cmdline file provides
access to similar information.
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