ArchLinux

Install: sudo pacman -S udiskie;

Start service: run udiskie & manually when system startup, or add "udiskie &" into ~/.xinitrc;

Now when you plug USB key into computer, it will be automount to /media folder.

Unmount USB disk

Create an executable script in /usr/local/bin:

$ cat /usr/local/bin/unmount
#!/bin/sh

# Global variables
TITLE="Unmount Utility"
COLUMNS=3 # TARGET,SOURCE,FSTYPE
#IFS=$'\n'

# Populate list of unmountable devices
deviceList=($(findmnt -Do TARGET,SOURCE,FSTYPE | grep -e "sd[b-z]"))
deviceCount=$((${#deviceList[@]} / $COLUMNS))

# Start of program output
echo $TITLE

# Display list of devices that can be unmounted
for ((device=0; device<${#deviceList[@]}; device+=COLUMNS))
do
  printf "%4s)   %-25s%-13s%-10s\n"\
    "$(($device / $COLUMNS))"\
    "${deviceList[$device]}"\
    "${deviceList[$(($device + 1))]}"\
    "${deviceList[$(($device + 2))]}"
done

printf "%4s)   Exit\n" "x"

# Get input from user
read -p "Choose a menu option: " input

# Input validation
if [ "$input" = "X" ] || [ "$input" = "x" ]
then
  echo "Exiting"
  exit 0
fi

if (( $input>=0 )) && (( $input<$deviceCount ))
then
  echo "Unmounting: ${deviceList[$(($input * $deviceCount))]}"
  sudo umount "${deviceList[$(($input * $deviceCount))]}"
  exit 0
else
  echo "Invalid menu choice"
  exit 1
fi
$ chmod 755 /usr/local/bin/unmount

Now when eject USB disk, run unmount, and choose a menu item to eject. See USB storage devices for details. Or use udiskie-umount -a to unmount it manually.

See man udiskie for more information.

Mint

Install: sudo apt install udevil;

Start service: run devmon in dmenu when system startup, or add "devmon &" into ~/.xsession;

After plug USB key into computer, it will be automount to /media folder. If you do not startup devmon in background, you can run devmon -a to mount the USB key.

Run devmon -c to unmount the USB key.

See man devmon for more information.

Difference between .xinitrc and .xsession:

If you startup your system with display manager, where you get a graphical login screen, it will read ~/.xsession. In case of you startup your system without display manager and login to shell, startup i3 (or other wm) with startx, then the xinit program will read ~/.xinitrc;

See What is “.xsession” for? for details.

See Arch boot process for how Getty manage login process in system boot process.