timing_slave: 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/timing_slave - from package: pvm-examples

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

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