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#define _GNU_SOURCE /* See feature_test_macros(7) */
extern char *program_invocation_name;
extern char *program_invocation_short_name;
program_invocation_name contains the name that was used to invoke the
calling program. This is the same as the value of argv in main(),
with the difference that the scope of program_invocation_name is
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
These variables are GNU extensions, and should not be used in programs
intended to be portable.
The Linux-specific /proc/[number]/cmdline file provides access to simi-
GNU 2006-04-29 INVOCATION_NAME(3)