spnavcfg: 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/spnavcfg - from package: spnavcfg

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

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