owltsim: 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/owltsim - from package: ion

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

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