~/.config/awesome/rc.lua: Add shortcut to take screenshots.

.config/awesome/rc.lua

    awful.key({ modkey, "Shift" }, "l", function() os.execute("slock") end),
    awful.key({ modkey }, "b", function() awful.util.spawn("chromium --allow-file-access-from-files", false) end),
    awful.key({ modkey, "Shift" }, "b", function() awful.util.spawn("chromium --incognito --allow-file-access-from-files", false) end),
    awful.key({ }, "Print", function ()
        awful.util.spawn("scrot -e 'mv $f ~/m/pictures/ 2>/dev/null'")
    end),
	 awful.key({ }, "XF86AudioMute", function() os.execute("amixer set Master toggle") end),
    awful.key({ }, "XF86AudioLowerVolume", function() os.execute("amixer set Master 5%-") end),