Ejecutar comandos linux via web?

[chr_c]

dos cosas, revisa bien la sintaxis de las lineas que te pase.. ya que puede que difiera algo. en la documentacion de apache.
y la otra le asignaste una clave al usuario que creaste con htpasswd????
y revisa estas lineas en el httpd.conf, aca esta la activacion en si dentro de apache!!!!

<Directory "/var/www">

#
# This may also be "None", "All", or any combination of "Indexes",
# "Includes", "FollowSymLinks", "ExecCGI", or "MultiViews".
#
# Note that "MultiViews" must be named *explicitly* --- "Options All"
# doesn't give it to you.
#
Options Indexes FollowSymLinks MultiViews ExecCGI Includes

#
# This controls which options the .htaccess files in directories can
# override. Can also be "All", or any combination of "Options", "FileInfo",
# "AuthConfig", and "Limit"
#
AllowOverride All

#
# Controls who can get stuff from this server.
#
Order allow,deny
Allow from all
</Directory>