tthrfcat: 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/tthrfcat - from package: tth-common

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

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