Customize Awesome Startup Application

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Let applications automatically start at boot will greatly save your time in configurating the system. Following is some tips on how to automatically start applications in awesome desktop environment.
###Xinit Way My startup configuration is listed as:

export GTK_IM_MODULE=fcitx
export QT_IM_MODULE=fcitx
export XMODIFIERS="@im=fcitx"
exec awesome

So the awesome environment will be started.
###Awesome Way Run only once in awesome desktop, via following configuration file:

function run_once(cmd)
  findme = cmd
  firstspace = cmd:find(" ")
  if firstspace then
    findme = cmd:sub(0, firstspace-1)
  awful.util.spawn_with_shell("pgrep -u $USER -x " .. findme .. " > /dev/null || (" .. cmd .. ")")

run_once("udiskie -2 --tray")
run_once("wicd-client --tray")

Add the code into ~/.config/awesome/rc.lua, then you can get the udiskie and wicd-client icon in the tray.
###Change View Way

killall conky
xrandr --output LVDS1 --mode 1366x768
xrandr --newmode $(gtf 1920 1080 60 | grep Modeline | sed s/Modeline\ // | tr -d '"')
xrandr --addmode VGA1 1920x1080_60.00
xrandr --output VGA1 --mode 1920x1080_60.00 --right-of LVDS1
xscreensaver -nosplash &
xset -b
xmodmap -e "pointer = 3 2 1"
fcitx &
sleep 2
sudo whatpulse &
conky &

###Systemd Way For example, we want to enable xampp.service on every start:

[root@DashArch system]# pwd
[root@DashArch system]# cat xampp.service

Description=xampp for ArchLinux, locate in /opt/lampp

ExecStart=/opt/lampp/lampp start 
ExecStop=/opt/lampp/lampp stop


Then we can start/stop the service, enable/disable the service via:

systemctl start xampp.service
systemctl stop xampp.service
systemctl enable xampp.service