rocs: 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 Debian possible default full paths are:

/usr/bin/rocs - from package: rocs

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