piuparts_slave_join: 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/piuparts_slave_join - from package: piuparts-slave

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

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