rview: 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:

/bin/rview - from package: vim-minimal

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

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