ipython simple prompt option

src/bin/sage

@@ -66,7 +66,7 @@ usage_advanced() {
     echo "  -preparse <file.sage> -- preparse file.sage and produce corresponding file.sage.py"
     echo "  -q                  -- quiet; start with no banner"
     echo "  -root               -- print the Sage root directory"
-    echo "  -gthread, -qthread, -q4thread, -wthread, -pylab"
+    echo "  -gthread, -qthread, -q4thread, -wthread, -pylab, --simple-prompt"
     echo "                      -- pass the option through to ipython"
     echo "  -v, -version        -- display Sage version information"
     echo "  -dumpversion        -- print Sage version"
@@ -1043,7 +1043,7 @@ if [ "$1" = '-startuptime' -o "$1" = '--startuptime' ]; then
     exec sage-startuptime.py "$@"
 fi
 
-if [ "$1" = '-gthread' -o "$1" = '-qthread' -o "$1" = '-q4thread' -o "$1" = '-wthread' -o "$1" = '-pylab' ]; then
+if [ "$1" = '-gthread' -o "$1" = '-qthread' -o "$1" = '-q4thread' -o "$1" = '-wthread' -o "$1" = '-pylab' -o "$1" = '--simple-prompt']; then
     # Intentionally no "shift" here
     interactive_sage "$@"
 fi