pxz: 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/pxz - from package: pxz

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

On Debian possible default full paths are:

/usr/bin/pxz - from package: pxz

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

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