sdrc: 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/sdrc - from package: Pixie

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

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