owhttpd: 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

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/owhttpd - from package: owhttpd

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