pdl: 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/pdl - from package: perl-PDL

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

On Debian possible default full paths are:

/usr/bin/pdl - from package: pdl

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

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