oscsend: command not found

Have You tried accessing the binary with the full path?

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 CentOS possible default full paths are:

/usr/bin/oscsend - from package: liblo

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/oscsend - from package: liblo-tools

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