pwdecrypt: 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/pwdecrypt - from package: libnss3-tools

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

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