pcl2fax: 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/pcl2fax - from package: hylafax+-client

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

On Debian possible default full paths are:

/var/spool/hylafax/bin/pcl2fax - from package: hylafax-server

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

Error in other languages:
pcl2fax: bevel nie gevind nie
pcl2fax: comandă negăsită
pcl2fax: comando não encontrado
pcl2fax: commande introuvable
pcl2fax: command not found
pcl2fax: käsku ei ole
pcl2fax: không tìm thấy lệnh
pcl2fax: komanda nerasta
pcl2fax: Kommando nicht gefunden.
pcl2fax: kommandot finns inte
pcl2fax: komut yok
pcl2fax: nie znaleziono polecenia
pcl2fax: níor aimsíodh an t-ordú
pcl2fax: no se encontró la orden
pcl2fax: no s'ha trobat l'ordre
pcl2fax: opdracht niet gevonden
pcl2fax: parancs nem található
pcl2fax: perintah tidak ditemukan
pcl2fax: príkaz nenájdený
pcl2fax: příkaz nenalezen
pcl2fax: команда не найдена
pcl2fax: командата не е открита
pcl2fax: 命令找不到
pcl2fax: コマンドが見つかりません