tcp2file: 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/tcp2file - from package: ion

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

Error in other languages:
tcp2file: bevel nie gevind nie
tcp2file: comandă negăsită
tcp2file: comando não encontrado
tcp2file: commande introuvable
tcp2file: command not found
tcp2file: käsku ei ole
tcp2file: không tìm thấy lệnh
tcp2file: komanda nerasta
tcp2file: Kommando nicht gefunden.
tcp2file: kommandot finns inte
tcp2file: komut yok
tcp2file: nie znaleziono polecenia
tcp2file: níor aimsíodh an t-ordú
tcp2file: no se encontró la orden
tcp2file: no s'ha trobat l'ordre
tcp2file: opdracht niet gevonden
tcp2file: parancs nem található
tcp2file: perintah tidak ditemukan
tcp2file: príkaz nenájdený
tcp2file: příkaz nenalezen
tcp2file: команда не найдена
tcp2file: командата не е открита
tcp2file: 命令找不到
tcp2file: コマンドが見つかりません