send_osc: 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/send_osc - from package: pyliblo-utils

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

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