redmode: 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/redmode - from package: redmode

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

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