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+.\" Copyright (C) 2006 Michael Kerrisk <mtk.manpages@gmail.com>
+.\"
+.\" %%%LICENSE_START(PERMISSIVE_MISC)
+.\" Permission is hereby granted, free of charge, to any person obtaining
+.\" a copy of this software and associated documentation files (the
+.\" "Software"), to deal in the Software without restriction, including
+.\" without limitation the rights to use, copy, modify, merge, publish,
+.\" distribute, sublicense, and/or sell copies of the Software, and to
+.\" permit persons to whom the Software is furnished to do so, subject to
+.\" the following conditions:
+.\"
+.\" The above copyright notice and this permission notice shall be
+.\" included in all copies or substantial portions of the Software.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+.\" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+.\" IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+.\" CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+.\" TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+.\" SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+.\" %%%LICENSE_END
+.\"
+.TH program_invocation_name 3 (date) "Linux man-pages (unreleased)"
+.SH NAME
+program_invocation_name, program_invocation_short_name \- \
+obtain name used to invoke calling program
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.BR "#define _GNU_SOURCE" "         /* See feature_test_macros(7) */"
+.B #include <errno.h>
+.P
+.BI "extern char *" program_invocation_name ;
+.BI "extern char *" program_invocation_short_name ;
+.fi
+.SH DESCRIPTION
+.I program_invocation_name
+contains the name that was used to invoke the calling program.
+This is the same as the value of
+.I argv[0]
+in
+.IR main (),
+with the difference that the scope of
+.I program_invocation_name
+is global.
+.P
+.I 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
+.IR program_invocation_name ,
+with all text up to and including the final slash (/), if any, removed.
+.P
+These variables are automatically initialized by the glibc run-time
+startup code.
+.SH VERSIONS
+The Linux-specific
+.IR /proc/ pid /cmdline
+file provides access to similar information.
+.SH STANDARDS
+GNU.
+.SH SEE ALSO
+.BR proc (5)