v7 man page for program_invocation_short_name

INVOCATION_NAME(3)					     Linux Programmer's Manual						INVOCATION_NAME(3)

NAME
       program_invocation_name, program_invocation_short_name - obtain name used to invoke calling program

SYNOPSIS
       #define _GNU_SOURCE	   /* See feature_test_macros(7) */
       #include <errno.h>

       extern char *program_invocation_name;
       extern char *program_invocation_short_name;

DESCRIPTION
       program_invocation_name contains the name that was used to invoke the calling program.  This is the same as the value of argv[0] in main(),
       with the difference that the scope of 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.

CONFORMING TO
       These variables are GNU extensions, and should not be used in programs intended to be portable.

NOTES
       The Linux-specific /proc/[number]/cmdline file provides access to similar information.

SEE ALSO
       proc(5)

COLOPHON
       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2017-09-15							INVOCATION_NAME(3)