pwauth: 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 CentOS possible default full paths are:

/usr/bin/pwauth - from package: pwauth

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/sbin/pwauth - from package: pwauth

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

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