pax: 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/pax - from package: pax

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

On Debian possible default full paths are:

/bin/pax - from package: pax

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

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