joinleave: 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/joinleave - from package: pvm-examples

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

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