comparoob: 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/comparoob - from package: weboob

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

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