outguess: 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/outguess - from package: outguess

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

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