vile-pager: 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/vile-pager - from package: vile

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

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