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made sure that rcmain.local runs independent of the existence  of $home/lib/profile. Documented /rc/lib/rcmain, /rc/lib/rcmain.local, $home/lib/profile in rc(1) and the first two in namespace(4)

--- a/rc/lib/rcmain

+++ b/rc/lib/rcmain

@@ -16,17 +16,17 @@

 }

 fn sigexit

 if(! ~ $#cflag 0){

-	if(flag l && /bin/test -r $home/lib/profile){

+	if(flag l){

 		if(/bin/test -r /rc/lib/rcmain.local) . /rc/lib/rcmain.local

-		. $home/lib/profile

+		if(/bin/test -r $home/lib/profile) . $home/lib/profile

 	}

 	status=''

 	eval $cflag

 }

 if not if(flag i){

-	if(flag l && /bin/test -r $home/lib/profile){

+	if(flag l){

 		if(/bin/test -r /rc/lib/rcmain.local) . /rc/lib/rcmain.local

-		. $home/lib/profile

+		if(/bin/test -r $home/lib/profile) . $home/lib/profile

 	}

 	status=''

 	if(! ~ $#* 0) . $*

--- a/sys/man/1/rc

+++ b/sys/man/1/rc

@@ -973,6 +973,19 @@

 .PD

 .SH SOURCE

 .B /sys/src/cmd/rc

+.SH FILES

+.TF $home/lib/profile

+.TP

+.B $home/lib/profile

+the user's local rc start script

+.TF /rc/lib/rcmain

+.TP

+.B /rc/lib/rcmain

+System rc start script

+.TF /rc/lib/rcmain.local

+.TP

+.B /rc/lib/rcmain.local

+Site specific system rc start script

 .SH "SEE ALSO"

 Tom Duff,

 ``Rc \- The Plan 9 Shell''.

--- a/sys/man/4/namespace

+++ b/sys/man/4/namespace

@@ -153,6 +153,10 @@

 Startup code for

 .IR rc (1).

 .TP

+.B /rc/lib/rcmain.local

+Site local startup code for

+.IR rc (1).

+.TP

 .B /lib

 Collections of data, generally not parts of programs.

 .TP