iclass: 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/iclass - from package: ivtools-bin

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

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