ocsigenserver: 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/ocsigenserver - from package: ocsigenserver

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

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