Section (3) program_invocation_name
program_invocation_name, program_invocation_short_name — obtain name used to invoke calling program
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <errno.h> extern char *program_invocation_name; extern char *program_invocation_short_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_short_name contains the
basename component of name that was used to invoke the
calling program. That is, it is the same value as
all text up to and including the final slash (/), if any,
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.
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