What does this mean? Post: 302602602

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Top Forums Shell Programming and Scripting What does this mean? Post 302602602 by bentheITman on Monday 27th of February 2012 09:05:47 PM

02-27-2012

Registered User

What does this mean?

Ok I am a PC/Network technician at a local energy company, the how or why isn't really important, but I am a linux amatuer and I need to know what these scripts mean.

Code:

1. #!/bin/bash
2. #
3. date
4. echo 'Would you like to execute the command (y/n)? \c'
5. read ANSWER
6. if [ $ANSWER = "y" -o $ANSWER = "Y" ]
7. then
8. find /media/backup -name '*.tar.gz' -type f -daystart -ctime +7 -exec rm -f {} \;
9. else
10. find /media/backup -name '*.tar.gz' -type f -daystart -ctime +7 -print
11. fi

Code:

1. #!/bin/bash
2. #
3. date
4. case "$1" in
5. start)
6. echo '-- executing command in start section --'
7. SERVSTAT=`service httpd status | grep running`
8. if [ ${#SERVSTAT} -eq 0 ]
9. then
10. service httpd start
11. else
12. echo 'service already running'
13. fi
14. ;;
15. stop)
16. echo '-- executing command in stop section --'
17. SERVSTAT=`service httpd status | grep stopped`
18. if [ ${#SERVSTAT} -eq 0 ]
19. then
20. service httpd stop
21. else
22. echo 'service already stopped'
23. fi
24. ;;
25. restart)
26. echo '-- executing command in restart section --'
27. service httpd restart
28. ;;
29. esac

If someone could explain these two scripts to me in a detailed manner, line by line detail would be nice. This will help me immensely in my job, thanks!

Last edited by methyl; 02-28-2012 at 09:27 AM.. Reason: remove microfont, add code tags

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httpd2

HTTPD(8)							       httpd								  HTTPD(8)

NAME

       httpd - Apache Hypertext Transfer Protocol Server

SYNOPSIS

       httpd [ -d serverroot ] [ -f config ] [ -C directive ] [ -c directive ] [ -D parameter ] [ -e level ] [ -E file ] [ -k start|restart|grace-
       ful|stop|graceful-stop ] [ -R directory ] [ -h ] [ -l ] [ -L ] [ -S ] [ -t ] [ -v ] [ -V ] [ -X ] [ -M ]

       On Windows systems, the following additional arguments are available:

       httpd [ -k install|config|uninstall ] [ -n name ] [ -w ]

SUMMARY

       httpd is the Apache HyperText Transfer Protocol (HTTP) server program. It is designed to be run as a standalone daemon process.	When  used
       like this it will create a pool of child processes or threads to handle requests.

       In  general, httpd should not be invoked directly, but rather should be invoked via apachectl on Unix-based systems or as a service on Win-
       dows NT, 2000 and XP and as a console application on Windows 9x and ME.

OPTIONS

       -d serverroot
	      Set the initial value for the ServerRoot directive to serverroot. This can be overridden by the ServerRoot directive in the configu-
	      ration file. The default is /usr/local/apache2.

       -f config
	      Uses  the directives in the file config on startup. If config does not begin with a /, then it is taken to be a path relative to the
	      ServerRoot. The default is conf/httpd.conf.

       -k start|restart|graceful|stop|graceful-stop
	      Signals httpd to start, restart, or stop. See Stopping Apache for more information.

       -C directive
	      Process the configuration directive before reading config files.

       -c directive
	      Process the configuration directive after reading config files.

       -D parameter
	      Sets a configuration parameter which can be used with <IfDefine> sections in  the  configuration	files  to  conditionally  skip	or
	      process commands at server startup and restart. Also can be used to set certain less-common startup parameters including -DNO_DETACH
	      (prevent the parent from forking) and -DFOREGROUND (prevent the parent from calling setsid() et al).

       -e level
	      Sets the LogLevel to level during server startup. This is useful for temporarily increasing the verbosity of the error  messages	to
	      find problems during startup.

       -E file
	      Send error messages during server startup to file.

       -R directory
	      When the server is compiled using the SHARED_CORE rule, this specifies the directory for the shared object files.

       -h     Output a short summary of available command line options.

       -l     Output  a  list  of  modules  compiled  into the server. This will not list dynamically loaded modules included using the LoadModule
	      directive.

       -L     Output a list of directives together with expected arguments and places where the directive is valid.

       -M     Dump a list of loaded Static and Shared Modules.

       -S     Show the settings as parsed from the config file (currently only shows the virtualhost settings).

       -t     Run syntax tests for configuration files only. The program immediately exits after these syntax parsing tests with either  a  return
	      code  of 0 (Syntax OK) or return code not equal to 0 (Syntax Error). If -D DUMP_VHOSTS is also set, details of the virtual host con-
	      figuration will be printed. If -D DUMP_MODULES  is set, all loaded modules will be printed.

       -v     Print the version of httpd, and then exit.

       -V     Print the version and build parameters of httpd, and then exit.

       -X     Run httpd in debug mode. Only one worker will be started and the server will not detach from the console.

       The following arguments are available only on the Windows platform:

       -k install|config|uninstall
	      Install Apache as a Windows NT service; change startup options for the Apache service; and uninstall the Apache service.

       -n name
	      The name of the Apache service to signal.

       -w     Keep the console window open on error so that the error message can be read.

Apache HTTP Server						    2007-08-01								  HTTPD(8)