vegrep: 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/vegrep - from package: atfs

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

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