Added the appropriate #! magic at the beginning of shell scripts. (Some modern shells don't like scripts to be without it.)

first/create_dir

@@ -0,0 +1,13 @@
+#!/bin/sh
+
+if ( cd $1 ) 2>/dev/null
+then
+	:
+elif mkdir $1 2>/dev/null
+then
+	:
+else
+	echo $0: could not create directory $1 1>&2
+	exit 1
+fi
+exit 0