Bash command to focus a specific window

The wmctrl command seems to do the job. It was already installed for me, but it's available in the repositories in case anyone needs it.

wmctrl -l 

Lists currently open windows (including the gnome panels).

wmctrl -a STRING

Gives focus to a window containing STRING in its title. I'm not sure what happens if more than one window meets that condition.
In my case the command was:

wmctrl -a Firefox

Using wmctrl in combination with xdotool you can switch focus to Firefox and then perform keyboard or mouse actions.

In this example:

wmctrl -R firefox && \
  xdotool key --clearmodifiers ctrl+t ctrl+l && \
  xdotool type --delay=250 google && \
  xdotool key --clearmodifiers Tab Return

The following steps are executed:

1. Give focus to the first matching Firefox window
2. Open a new browser tab
3. Puts focus in the address bar
4. Type "google"
5. Tab to the first browser auto-complete result
6. Press the Return (or Enter) key

How's the below script that I use in my ubuntu pc? use case is like this.

   $ ./focus_win.sh 1            # focus on a application window that executed at first
   $ ./focus_win.sh 2            # second executed application window

I'm using it after assigning it in keyboard custom shortcut. ctrl+1, ctrl+2, ...

cat focus_win.sh

#! /bin/sh

if [ "" = "$1" ] ; then
    echo "usage $0 <win index>"
    exit 1;
fi

WIN_ID=`wmctrl -l | cut -d ' ' -f1 | head -n $1 | tail -n 1`

if [ "" = "$WIN_ID" ] ; then
    echo "fail to get win id of index $1"
    exit 1;
fi
wmctrl -i -a $WIN_ID