rvim: 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/rvim - from package: vim-enhanced

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

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