alternatives: 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/sbin/alternatives - from package: chkconfig

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

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