pdf2dsc: 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/pdf2dsc - from package: ghostscript

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

On Debian possible default full paths are:

/usr/bin/pdf2dsc - from package: ghostscript

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

Error in other languages:
pdf2dsc: bevel nie gevind nie
pdf2dsc: comandă negăsită
pdf2dsc: comando não encontrado
pdf2dsc: commande introuvable
pdf2dsc: command not found
pdf2dsc: käsku ei ole
pdf2dsc: không tìm thấy lệnh
pdf2dsc: komanda nerasta
pdf2dsc: Kommando nicht gefunden.
pdf2dsc: kommandot finns inte
pdf2dsc: komut yok
pdf2dsc: nie znaleziono polecenia
pdf2dsc: níor aimsíodh an t-ordú
pdf2dsc: no se encontró la orden
pdf2dsc: no s'ha trobat l'ordre
pdf2dsc: opdracht niet gevonden
pdf2dsc: parancs nem található
pdf2dsc: perintah tidak ditemukan
pdf2dsc: príkaz nenájdený
pdf2dsc: příkaz nenalezen
pdf2dsc: команда не найдена
pdf2dsc: командата не е открита
pdf2dsc: 命令找不到
pdf2dsc: コマンドが見つかりません