decryptdir: 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/decryptdir - from package: expect

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

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