pixz: 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/pixz - from package: pixz

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

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