spax: 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/spax - from package: star

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

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