pphs: 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/pphs - from package: ghostscript

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

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