ideviceenterrecovery: 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/ideviceenterrecovery - from package: libimobiledevice-utils

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

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