mozhttpd: 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 CentOS possible default full paths are:

/usr/bin/mozhttpd - from package: python-mozhttpd

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

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