diff --git a/awesome-client.c b/awesome-client.c
index 80de4d423..fb373fcd0 100644
--- a/awesome-client.c
+++ b/awesome-client.c
@@ -63,10 +63,10 @@ send_msg(const char *msg, ssize_t msg_len)
         switch (errno)
         {
           case ENOENT:
-              warn("can't write to %s\n", addr->sun_path);
+              warn("can't write to %s", addr->sun_path);
               break;
           default:
-              warn("error sending datagram: %s\n", strerror(errno));
+              warn("error sending datagram: %s", strerror(errno));
          }
          ret_value = errno;
     }
diff --git a/awesome.c b/awesome.c
index f02d7b5fb..bd8df3d20 100644
--- a/awesome.c
+++ b/awesome.c
@@ -114,7 +114,7 @@ scan()
         /* Get the tree of the children Windows of the current root
          * Window */
         if(!(wins = xcb_query_tree_children(tree_r)))
-            eprint("E: cannot get tree children\n");
+            eprint("E: cannot get tree children");
         tree_c_len = xcb_query_tree_children_length(tree_r);
         attr_wins = p_new(xcb_get_window_attributes_cookie_t, tree_c_len);
 
@@ -206,7 +206,7 @@ xerrorstart(void * data __attribute__ ((unused)),
             xcb_connection_t * c  __attribute__ ((unused)),
             xcb_generic_error_t * error __attribute__ ((unused)))
 {
-    eprint("another window manager is already running\n");
+    eprint("another window manager is already running");
 }
 
 /** Function to exit on some signals.
@@ -244,7 +244,7 @@ xerror(void *data __attribute__ ((unused)),
         return 0;
     }
 
-    warn("fatal error: request=%s, error=%s\n", err->request_label, err->error_label);
+    warn("fatal error: request=%s, error=%s", err->request_label, err->error_label);
     xutil_delete_error(err);
 
     /*
@@ -334,7 +334,7 @@ main(int argc, char **argv)
             if(a_strlen(optarg))
                 confpath = a_strdup(optarg);
             else
-                eprint("-c option requires a file name\n");
+                eprint("-c option requires a file name");
             break;
         }
 
@@ -344,7 +344,7 @@ main(int argc, char **argv)
     /* X stuff */
     globalconf.connection = xcb_connect(NULL, &globalconf.default_screen);
     if(xcb_connection_has_error(globalconf.connection))
-        eprint("cannot open display\n");
+        eprint("cannot open display");
 
     /* Get the file descriptor corresponding to the X connection */
     xfd = xcb_get_file_descriptor(globalconf.connection);
@@ -466,12 +466,12 @@ main(int argc, char **argv)
         if(errno == EADDRINUSE)
         {
             if(unlink(addr->sun_path))
-                warn("error unlinking existing file: %s\n", strerror(errno));
+                warn("error unlinking existing file: %s", strerror(errno));
             if(bind(csfd, (const struct sockaddr *) addr, SUN_LEN(addr)))
-                warn("error binding UNIX domain socket: %s\n", strerror(errno));
+                warn("error binding UNIX domain socket: %s", strerror(errno));
         }
         else
-            warn("error binding UNIX domain socket: %s\n", strerror(errno));
+            warn("error binding UNIX domain socket: %s", strerror(errno));
     }
 
     if(!a_dbus_init(&dbusfd))
@@ -502,13 +502,13 @@ main(int argc, char **argv)
         {
             if(errno == EINTR)
                 continue;
-            eprint("select failed\n");
+            eprint("select failed");
         }
         if(csfd >= 0 && FD_ISSET(csfd, &rd))
             switch(r = recv(csfd, buf, sizeof(buf)-1, MSG_TRUNC))
             {
               case -1:
-                warn("error reading UNIX domain socket: %s\n", strerror(errno));
+                warn("error reading UNIX domain socket: %s", strerror(errno));
                 csfd = -1;
                 break;
               case 0:
@@ -558,9 +558,9 @@ main(int argc, char **argv)
     a_dbus_cleanup();
 
     if(csfd > 0 && close(csfd))
-        warn("error closing UNIX domain socket: %s\n", strerror(errno));
+        warn("error closing UNIX domain socket: %s", strerror(errno));
     if(unlink(addr->sun_path))
-        warn("error unlinking UNIX domain socket: %s\n", strerror(errno));
+        warn("error unlinking UNIX domain socket: %s", strerror(errno));
     p_delete(&addr);
 
     /* remap all clients since some WM won't handle them otherwise */
diff --git a/common/draw.c b/common/draw.c
index 6e8eeccf5..bbc685bdb 100644
--- a/common/draw.c
+++ b/common/draw.c
@@ -70,7 +70,7 @@ draw_iso2utf8(const char *iso)
             warn("unable to convert text from %s to UTF-8, not available",
                  nl_langinfo(CODESET));
         else
-            warn("unable to convert text: %s\n", strerror(errno));
+            warn("unable to convert text: %s", strerror(errno));
 
         return NULL;
     }
@@ -80,7 +80,7 @@ draw_iso2utf8(const char *iso)
 
     if(iconv(iso2utf8, (char **) &iso, &len, &utf8, &utf8len) == (size_t) -1)
     {
-        warn("text conversion failed: %s\n", strerror(errno));
+        warn("text conversion failed: %s", strerror(errno));
         p_delete(&utf8p);
     }
 
@@ -725,7 +725,7 @@ draw_image(draw_context_t *ctx, int x, int y, int wanted_h, const char *filename
     GError *error=NULL;
 
     if(!(pixbuf = gdk_pixbuf_new_from_file(filename,&error)))
-        return warn("cannot load image %s: %s\n", filename, error->message);
+        return warn("cannot load image %s: %s", filename, error->message);
 
     w = gdk_pixbuf_get_width(pixbuf);
     h = gdk_pixbuf_get_height(pixbuf);
@@ -763,7 +763,7 @@ draw_get_image_size(const char *filename)
         size.height = height;
     }
     else
-        warn("cannot load image %s: %s\n", filename, "format unrecognized");
+        warn("cannot load image %s: %s", filename, "format unrecognized");
 
     return size;
 }
@@ -828,7 +828,7 @@ draw_image(draw_context_t *ctx, int x, int y, int wanted_h, const char *filename
     Imlib_Load_Error e = IMLIB_LOAD_ERROR_NONE;
 
     if(!(image = imlib_load_image_with_error_return(filename, &e)))
-        return warn("cannot load image %s: %s\n", filename, draw_imlib_load_strerror(e));
+        return warn("cannot load image %s: %s", filename, draw_imlib_load_strerror(e));
 
     imlib_context_set_image(image);
     h = imlib_image_get_height();
@@ -877,7 +877,7 @@ draw_get_image_size(const char *filename)
         imlib_free_image();
     }
     else
-        warn("cannot load image %s: %s\n", filename, draw_imlib_load_strerror(e));
+        warn("cannot load image %s: %s", filename, draw_imlib_load_strerror(e));
 
     return size;
 }
@@ -1029,7 +1029,7 @@ draw_color_new(xcb_connection_t *conn, int phys_screen, const char *colstr, xcol
         colnum = strtoul(&colstr[1], NULL, 16);
         if(errno != 0)
         {
-            warn("awesome: error, invalid color '%s'\n", colstr);
+            warn("awesome: error, invalid color '%s'", colstr);
             return false;
         }
 
@@ -1075,7 +1075,7 @@ draw_color_new(xcb_connection_t *conn, int phys_screen, const char *colstr, xcol
         }
     }
 
-    warn("awesome: error, cannot allocate color '%s'\n", colstr);
+    warn("awesome: error, cannot allocate color '%s'", colstr);
     return false;
 }
 
diff --git a/common/markup.c b/common/markup.c
index dbedba9b9..da10f7366 100644
--- a/common/markup.c
+++ b/common/markup.c
@@ -241,7 +241,7 @@ markup_parse(markup_parser_data_t *data, const char *str, ssize_t slen)
        || !g_markup_parse_context_parse(mkp_ctx, "</markup>", -1, &error)
        || !g_markup_parse_context_end_parse(mkp_ctx, &error))
     {
-        warn("unable to parse text \"%s\": %s\n", str, error ? error->message : "unknown error");
+        warn("unable to parse text \"%s\": %s", str, error ? error->message : "unknown error");
         if(error)
             g_error_free(error);
         g_markup_parse_context_free(mkp_ctx);
diff --git a/common/socket.c b/common/socket.c
index acff7a1dd..3805f1b67 100644
--- a/common/socket.c
+++ b/common/socket.c
@@ -89,7 +89,7 @@ socket_getclient(void)
     csfd = socket(AF_UNIX, SOCK_DGRAM, 0);
 
     if(csfd < 0)
-        warn("error opening UNIX domain socket: %s\n", strerror(errno));
+        warn("error opening UNIX domain socket: %s", strerror(errno));
 
     return csfd;
 }
diff --git a/common/util.c b/common/util.c
index e2603d96a..898a3cdb5 100644
--- a/common/util.c
+++ b/common/util.c
@@ -39,6 +39,7 @@ _eprint(int line, const char *fct, const char *fmt, ...)
     fprintf(stderr, "E: awesome: %s:%d: ", fct, line);
     vfprintf(stderr, fmt, ap);
     va_end(ap);
+    fprintf(stderr, "\n");
     exit(EXIT_FAILURE);
 }
 
@@ -52,6 +53,7 @@ _warn(int line, const char *fct, const char *fmt, ...)
     fprintf(stderr, "W: awesome: %s:%d: ", fct, line);
     vfprintf(stderr, fmt, ap);
     va_end(ap);
+    fprintf(stderr, "\n");
 }
 
 /** Compute a value from a string containing
diff --git a/dbus.c b/dbus.c
index 675f7a21a..e56bcde0d 100644
--- a/dbus.c
+++ b/dbus.c
@@ -64,20 +64,20 @@ a_dbus_process_widget_set(DBusMessage *req)
        || a_strcmp(path[2], "widget")
        || a_strcmp(path[4], "property"))
     {
-        warn("invalid object path.\n");
+        warn("invalid object path.");
         dbus_error_free(&err);
         return;
     }
 
     if(!dbus_message_iter_init(req, &iter))
     {
-        warn("message has no argument: %s\n", err.message);
+        warn("message has no argument: %s", err.message);
         dbus_error_free(&err);
         return;
     }
     else if(DBUS_TYPE_STRING != dbus_message_iter_get_arg_type(&iter))
     {
-        warn("argument must be a string\n");
+        warn("argument must be a string");
         dbus_error_free(&err);
         return;
     }
@@ -85,7 +85,7 @@ a_dbus_process_widget_set(DBusMessage *req)
         dbus_message_iter_get_basic(&iter, &arg);
 
     if(!(widget = widget_getbyname(path[3])))
-        return warn("no such widget: %s.\n", path[3]);
+        return warn("no such widget: %s.", path[3]);
 
     status = widget->tell(widget, path[5], arg);
     widget_tell_managestatus(widget, status, path[5]);
@@ -140,7 +140,7 @@ a_dbus_init(int *fd)
     dbus_connection = dbus_bus_get(DBUS_BUS_SESSION, &err);
     if(dbus_error_is_set(&err))
     {
-        warn("DBus system bus connection failed: %s\n", err.message);
+        warn("DBus system bus connection failed: %s", err.message);
         dbus_connection = NULL;
         dbus_error_free(&err);
         return false;
@@ -152,21 +152,21 @@ a_dbus_init(int *fd)
 
     if(dbus_error_is_set(&err))
     {
-        warn("failed to request DBus name: %s\n", err.message);
+        warn("failed to request DBus name: %s", err.message);
         a_dbus_cleanup();
         return false;
     }
 
     if(ret != DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER)
     {
-        warn("not primary DBus name owner\n");
+        warn("not primary DBus name owner");
         a_dbus_cleanup();
         return false;
     }
 
     if(!dbus_connection_get_unix_fd(dbus_connection, fd))
     {
-        warn("cannot get DBus connection file descriptor\n");
+        warn("cannot get DBus connection file descriptor");
         a_dbus_cleanup();
         return false;
     }
diff --git a/lua.h b/lua.h
index 48f4156bc..80ed8f5af 100644
--- a/lua.h
+++ b/lua.h
@@ -34,7 +34,7 @@ typedef int luaA_function;
     do { \
         if(cmd) \
             if(luaL_dostring(L, cmd)) \
-                warn("error executing Lua code: %s\n", \
+                warn("error executing Lua code: %s", \
                      lua_tostring(L, -1)); \
     } while(0)
 
@@ -46,7 +46,7 @@ typedef int luaA_function;
             if(n) \
                 lua_insert(L, - (n + 1)); \
             if(lua_pcall(L, n, 0, 0)) \
-                warn("error running function: %s\n", \
+                warn("error running function: %s", \
                      lua_tostring(L, -1)); \
         } \
     } while(0)
diff --git a/widget.c b/widget.c
index 4f74c1ff8..72e9ec10a 100644
--- a/widget.c
+++ b/widget.c
@@ -96,7 +96,7 @@ widget_common_tell(widget_t *widget,
                    const char *property __attribute__ ((unused)),
                    const char *new_value __attribute__ ((unused)))
 {
-    warn("%s widget does not accept commands.\n", widget->name);
+    warn("%s widget does not accept commands.", widget->name);
     return WIDGET_ERROR_CUSTOM;
 }
 
@@ -227,23 +227,23 @@ widget_tell_managestatus(widget_t *widget, widget_tell_status_t status, const ch
     switch(status)
     {
       case WIDGET_ERROR:
-        warn("error changing property %s of widget %s\n",
+        warn("error changing property %s of widget %s",
              property, widget->name);
         break;
       case WIDGET_ERROR_NOVALUE:
-        warn("error changing property %s of widget %s, no value given\n",
+        warn("error changing property %s of widget %s, no value given",
               property, widget->name);
         break;
       case WIDGET_ERROR_FORMAT_FONT:
-        warn("error changing property %s of widget %s, must be a valid font\n",
+        warn("error changing property %s of widget %s, must be a valid font",
              property, widget->name);
         break;
       case WIDGET_ERROR_FORMAT_COLOR:
-        warn("error changing property %s of widget %s, must be a valid color\n",
+        warn("error changing property %s of widget %s, must be a valid color",
              property, widget->name);
         break;
       case WIDGET_ERROR_FORMAT_SECTION:
-        warn("error changing property %s of widget %s, section/title not found\n",
+        warn("error changing property %s of widget %s, section/title not found",
              property, widget->name);
         break;
       case WIDGET_NOERROR:
diff --git a/widgets/graph.c b/widgets/graph.c
index 1a07fe3ca..94fdbe55b 100644
--- a/widgets/graph.c
+++ b/widgets/graph.c
@@ -362,7 +362,7 @@ graph_tell(widget_t *widget, const char *property, const char *new_value)
           case Right:
             break;
           default:
-            warn("error changing property %s of widget %s, must be 'left' or 'right'\n",
+            warn("error changing property %s of widget %s, must be 'left' or 'right'",
                  property, widget->name);
             return WIDGET_ERROR_CUSTOM;
         }
@@ -400,14 +400,14 @@ graph_new(alignment_t align)
     /*
     if(!(d->data_items = cfg_size(config, "data")))
     {
-        warn("graph widget needs at least one data section\n");
+        warn("graph widget needs at least one data section");
         return w;
     }
 
     d->grow = cfg_getposition(config, "grow");
     if(d->grow != Left && d->grow != Right)
     {
-        warn("graph widget: 'grow' argument must be 'left' or 'right'\n");
+        warn("graph widget: 'grow' argument must be 'left' or 'right'");
         */
     /*
         d->data_items = 0; /* disable widget drawing */
diff --git a/widgets/progressbar.c b/widgets/progressbar.c
index 8715d960c..7a6bd5423 100644
--- a/widgets/progressbar.c
+++ b/widgets/progressbar.c
@@ -133,14 +133,14 @@ check_settings(Data *d, int status_height)
         if((d->ticks_count && tmp - (d->ticks_count - 1) * d->ticks_gap - d->ticks_count + 1 < 0)
            || (!d->ticks_count && tmp < 0))
         {
-            warn("progressbar's 'width' is too small for the given configuration options\n");
+            warn("progressbar's 'width' is too small for the given configuration options");
             return false;
         }
         tmp = h_total - d->data_items * (2 * (d->border_width + d->border_padding) + 1)
               - (d->data_items - 1) * d->gap;
         if(tmp < 0)
         {
-            warn("progressbar's 'height' is too small for the given configuration options\n");
+            warn("progressbar's 'height' is too small for the given configuration options");
             return false;
         }
     }
@@ -150,14 +150,14 @@ check_settings(Data *d, int status_height)
         if((d->ticks_count && tmp - (d->ticks_count - 1) * d->ticks_gap - d->ticks_count + 1 < 0)
            || (!d->ticks_count && tmp < 0))
         {
-            warn("progressbar's 'height' is too small for the given configuration options\n");
+            warn("progressbar's 'height' is too small for the given configuration options");
             return false;
         }
         tmp = d->width - d->data_items * (2 * (d->border_width + d->border_padding) + 1)
               - (d->data_items - 1) * d->gap;
         if(tmp < 0)
         {
-            warn("progressbar's 'width' is too small for the given configuration options\n");
+            warn("progressbar's 'width' is too small for the given configuration options");
             return false;
         }
     }
@@ -509,7 +509,7 @@ progressbar_new(alignment_t align)
     /*
     if(!(d->data_items = cfg_size(config, "data")))
     {
-        warn("progressbar widget needs at least one bar section\n");
+        warn("progressbar widget needs at least one bar section");
         return w;
     }