isotpsniffer: 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/isotpsniffer - from package: can-utils

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

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