clipboard -f implemented.

clipboard/clipboard

@@ -52,9 +52,23 @@ Equivalent to: B<tee >>B<(xsel -i -b) | xclip -i >>B</dev/null; xsel -o -b>
   cat | clipboard | cat
 
 
+=head1 OPTIONS
+
+=over 4
+
+=item B<-f>
+
+Run B<clipboard> every second. Only print output when it
+changes. Similar to B<tail -f>.
+
+Select the text 'END' to stop.
+
+
+=back
+
 =head1 AUTHOR
 
-Copyright (C) 2023 Ole Tange,
+Copyright (C) 2023-2024 Ole Tange,
 http://ole.tange.dk and Free Software Foundation, Inc.
 
 
@@ -87,6 +101,19 @@ B<tee>(1), B<xclip>(1), B<xsel>(1)
 #debug_log=/tmp/T-debug
 debug_log=/dev/null
 
+if [ "-f" = "$1" ]; then
+    # run until c = END
+    while [ "$c" != "END" ]; do
+	c=$(clipboard 2>/dev/null)
+	if [ "$c" != "$last" ]; then
+            echo "$c"
+            last="$c"
+	fi
+	sleep 1
+    done
+    exit 0
+fi
+
 if tty -s ; then
     # STDIN is terminal
     # Don't care what STDOUT is