ragrep: 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/ragrep - from package: argus-client

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

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