vile-to-html: 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-to-html - from package: vile

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

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