radeapclient: 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/radeapclient - from package: freeradius-utils

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

On Debian possible default full paths are:

/usr/bin/radeapclient - from package: freeradius-utils

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

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