tjf: 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/tjf - from package: pvm-examples

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

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