fatcat: 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/fatcat - from package: fatcat

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

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