isotpdump: 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/isotpdump - from package: can-utils

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

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