idecrypt: 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/sbin/idecrypt - from package: idecrypt

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

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