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import E script from bell labs

--- /dev/null

+++ b/rc/bin/E

@@ -1,0 +1,16 @@

+#!/bin/rc

+# E file - B file, wait until it changes, exit

+rfork e

+if (! ~ $#* 1) {

+	echo usage: $0 file >[1=2]

+	exit usage

+}

+if (! test -e $1) {

+	echo $0: $1: no such file >[1=2]

+	exit no-file

+}

+otm = `{mtime $1 | awk '{print $1}'}

+B $1

+while (~ $otm `{mtime $1 | awk '{print $1}'})

+	sleep 1

+exit ''

-- 

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