diff -r ac233c362502 dwm.c
--- a/dwm.c	Sat Sep 22 21:55:19 2007 +0200
+++ b/dwm.c	Sun Sep 23 01:42:54 2007 +0200
@@ -169,6 +169,7 @@ void setup(void);
 void setup(void);
 void spawn(const char *arg);
 void tag(const char *arg);
+void tagall(const char *arg);
 unsigned int textnw(const char *text, unsigned int len);
 unsigned int textw(const char *text);
 void tile(void);
@@ -1549,6 +1550,30 @@ tag(const char *arg) {
 	arrange();
 }
 
+void
+tagall(const char *arg) {
+	if (!clients)
+		return;
+	int floating_only = arg && arg[0] == 'F' ? 1 : 0;
+	int tag = arg ? atoi(arg + floating_only) : 0;
+	int j;
+	Client* c;
+	if(tag >= 0 && tag < LENGTH(tags))
+		for(c = clients; c; c = c->next)
+		{
+			if(!floating_only || c->isfloating)
+				for(j = 0; j < LENGTH(tags); j++)
+				{
+					if(c->tags[j] && seltags[j])
+					{
+						c->tags[j] = !c->tags[j];
+						c->tags[tag-1] = True;
+					}
+				}
+		}
+	arrange();
+}
+
 unsigned int
 textnw(const char *text, unsigned int len) {
 	XRectangle r;