ideviceinstaller: 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/ideviceinstaller - from package: ideviceinstaller

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

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