rds-info: 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/rds-info - from package: rds-tools

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

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