touchpad-edge-detector: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/touchpad-edge-detector - from package: libevdev-utils

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/touchpad-edge-detector - from package: libevdev-tools

You may install the required package with command apt-get install {package}

Error in other languages:
touchpad-edge-detector: bevel nie gevind nie
touchpad-edge-detector: comandă negăsită
touchpad-edge-detector: comando não encontrado
touchpad-edge-detector: commande introuvable
touchpad-edge-detector: command not found
touchpad-edge-detector: käsku ei ole
touchpad-edge-detector: không tìm thấy lệnh
touchpad-edge-detector: komanda nerasta
touchpad-edge-detector: Kommando nicht gefunden.
touchpad-edge-detector: kommandot finns inte
touchpad-edge-detector: komut yok
touchpad-edge-detector: nie znaleziono polecenia
touchpad-edge-detector: níor aimsíodh an t-ordú
touchpad-edge-detector: no se encontró la orden
touchpad-edge-detector: no s'ha trobat l'ordre
touchpad-edge-detector: opdracht niet gevonden
touchpad-edge-detector: parancs nem található
touchpad-edge-detector: perintah tidak ditemukan
touchpad-edge-detector: príkaz nenájdený
touchpad-edge-detector: příkaz nenalezen
touchpad-edge-detector: команда не найдена
touchpad-edge-detector: командата не е открита
touchpad-edge-detector: 命令找不到
touchpad-edge-detector: コマンドが見つかりません