vit: 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 Debian possible default full paths are:

/usr/bin/vit - from package: vit

You may install the required package with command apt-get install {package}

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