One liners, quick rant... Post: 302977420

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The Lounge What is on Your Mind? One liners, quick rant... Post 302977420 by Scrutinizer on Monday 18th of July 2016 03:50:17 AM

07-18-2016

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I think one-liners tend to have a bad rep for the wrong reasons.

One-liners are typically used for programming on the command line, where a single line is your real estate. They are very useful as one-off, terse and personal small scripts for an ad-hoc parsing result, for example for general information, problem determination or security forensics. Developing such a small script is usually a lot quicker than editing a file, exiting, running it, re-editing, etc... Typically sysadmins use one-liners a lot for this purpose.

Once a one liner is working and if it proves to be useful for multiple occasions, then it can be turned into a script in a file and then vertical real estate can be used and short names can be replaced by mnemonic names and comments can be added for maintainability and it can be made fool-proof with error conditions. In a script file one-liners are to be a avoided.

These are just two different types of application.

If a one-liner is posted here, it shows the principle or mechanism that can be used to tackle a problem or create an application. The user is free to use it and turn it into a fully maintainable script if he so chooses, or execute it as such on the command line and get his/her result..

Last edited by Scrutinizer; 07-18-2016 at 06:31 AM..

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LEARN ABOUT LINUX

a2dissite

A2ENSITE(8)                                                   System Manager's Manual                                                  A2ENSITE(8)

NAME

       a2ensite, a2dissite - enable or disable an apache2 site / virtual host

SYNOPSIS

       a2ensite [ [-q|--quiet] site]

       a2dissite [ [-q|--quiet] site]

DESCRIPTION

       This manual page documents briefly the a2ensite and a2dissite commands.

       a2ensite is a script that enables the specified site (which contains a <VirtualHost> block) within the apache2 configuration.  It does this
       by creating symlinks within /etc/apache2/sites-enabled.  Likewise, a2dissite disables a site by removing those  symlinks.   It  is  not  an
       error to enable a site which is already enabled, or to disable one which is already disabled.

       Apache  treats  the very first virtual host enabled specially as every request not matching any actual directive is being redirected there.
       Thus it should be called 000-default in order to sort before the remaining hosts to be loaded first.

OPTIONS

       -q, --quiet
              Don't show informative messages.

       -m, --maintmode
              Enables the maintainer mode, that is the program invocation is effectuated automatically by a maintainer script. This switch  should
              not be used by end users.

       -p, --purge
              When disabling a module, purge all traces of the module in the internal state data base.

EXIT STATUS

       a2ensite and a2dissite exit with status 0 if all sites are processed successfully, 1 if errors occur, 2 if an invalid option was used.

EXAMPLES

              a2dissite 000-default

       Disables the default site.

FILES

       /etc/apache2/sites-available
              Directory with files giving information on available sites.

       /etc/apache2/sites-enabled
              Directory with links to the files in sites-available for enabled sites.

SEE ALSO

       apache2ctl(8).

AUTHOR

       This  manual  page  was written by Stefan Fritsch <sf@debian.org> (based on the a2enmod manual page by Daniel Stone <daniel@sfarc.net>) for
       the Debian GNU/Linux distribution.

                                                                    8 June 2007                                                        A2ENSITE(8)