tfscan: 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/tfscan - from package: emboss

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

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