Checks that notify-send is available before running it

examples/stty-resize-copy

@@ -5,5 +5,5 @@
 
 columns=$(stty -a < /dev/stdin | grep -oE 'columns [0-9]+' | cut -d' ' -f2)
 rows=$(stty -a < /dev/stdin | grep -oE 'rows [0-9]+' | cut -d' ' -f2)
-notify-send "Terminal dimensions" "Rows: $rows\nColumns: $columns\nstty command on clipboard"
+type notify-send > /dev/null 2>&1 && notify-send "Terminal dimensions" "Rows: $rows\nColumns: $columns\nstty command on clipboard"
 echo "stty rows $rows cols $columns" | xclip -i -selection clipboard