funjoin: 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/funjoin - from package: funtools

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

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