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# Linux httpd Command [ Linux Command Manual](#) The Linux httpd command is the Apache HTTP server program. httpd is the Apache HTTP server program. Executing the program directly starts the server service. ### Syntax httpd **Parameter Description**: * -c Execute the directive in the option before reading the configuration file. * -C Execute the directive in the option after reading the configuration file. * -d Specify the server's root directory. * -D Specify the parameter to pass to the configuration file. * -f Specify the configuration file. * -h Display help. * -l Display the modules compiled into the server. * -L Display descriptions of httpd directives. * -S Display the settings in the configuration file. * -t Test the syntax of the configuration file for errors. * -v Display version information. * -V Display version information and the build environment. * -X Start the server in single-process mode. ### Examples Check for syntax errors in the configuration file # httpd -t httpd: Could not determine the server's fully qualified domain name, using 127.0.0.1 for ServerName Syntax OK Start httpd httpd httpd: Could not determine the server's fully qualified domain name, using 127.0.0.1 for ServerName Display compiled modules # httpd -l Compiled in modules: core.c prefork.c http_core.c mod_so.c Display configuration file # httpd -L>1.log|tail -n 20 1.logMaximum number of children alive at the same time Allowed in *.conf only outside , or ServerLimit (prefork.c)Maximum value of MaxClients for this run of ApacheAllowed in *.conf only outside , or KeepAliveTimeout (http_core.c)Keep-Alive timeout duration (sec)Allowed in *.conf only outside , or MaxKeepAliveRequests (http_core.c)Maximum number of Keep-Alive requests per connection, or 0 for infinite Allowed in *.conf only outside , or KeepAlive (http_core.c)Whether persistent connections should be On or OffAllowed in *.conf only outside , or LoadModule (mod_so.c) a module name and the name of a shared object file to load it fromAllowed in *.conf only outside , or LoadFile (mod_so.c) shared object file or library to load into the server at runtime Allowed in *.conf only outside , or [ Linux Command Manual](#)