mytool: 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 Debian possible default full paths are:

/usr/bin/mytool - from package: yudit

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

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