IDRTCalibration: 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/IDRTCalibration - from package: topp

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

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