kmouth: 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/kmouth - from package: kdeaccessibility

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

On Debian possible default full paths are:

/usr/bin/kmouth - from package: kmouth

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

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