auto-rotate.ps: 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:

/var/spool/hylafax/bin/auto-rotate.ps - from package: hylafax+

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

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