console(8): add console command and manpage

the console command runs a command or the system shell under
a new instance of kbdfs, optionally providing a serial console
when $console environment variable is set.

1 files changed, 16 insertions, 0 deletions

diff --git a/rc/bin/console b/rc/bin/console
new file mode 100755
index 000000000..87f24a726
--- /dev/null
+++ b/rc/bin/console
@@ -0,0 +1,16 @@
+#!/bin/rc
+
+if(~ $#* 0)
+	*=(rc -i)
+
+a=$console(1)
+if(! ~ $#a 0){
+	if(! ~ $a /* '#'*)
+		a=/dev/eia^$a
+	if(test -e /dev/kbd){
+		@{rfork ns; aux/kbdfs; exec $* </dev/cons >/dev/cons >[2=1]} | tee $a
+		exit
+	}
+}
+aux/kbdfs $a
+exec $* </dev/cons >/dev/cons >[2=1]