Hello World! Design Patterns

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News: Online-Werkzeuge

1 Shell Scripting

Obtaining unique search engine referrers from an httpd log/combined file:
grep -h "search?" one0-com-access.log | gawk "{ print $ 11 }" | sort | uniq

2 Reverse Polish Lisp for the HP48SX

Mandelbrot
@ function; returns color value for a given pixel (x; y)
@ global variable "maxcolor" and "maxiter" must be set
<< -> x y                 @ get pixel coordinates x, y
   << x y R->C 0 -> c i   @ convert to complex c; init iteration counter
      << c                @ place c as initial value of z on stack
         DO               @ start loop
            SQ c +        @    z := z**2 + c
         UNTIL            @ terminating condition:
            DUP ABS 2 >   @    check z for being greater than 2
            'i' INCR      @    increase and recall iteration counter and ...
            maxiter >     @    ... check it for being greater than maxiter
            OR            @    (ABS(z) > 2) OR (i > maxiter)
         END              @ end loop
         DROP             @ remove z from stack
         i maxcolor MOD   @ calculate and return pixel color value
      >>
   >>
>>

3 Apache Virtual Hosts

3.1 By Port Numbers

httpd.conf:

...
Listen 80
Listen 81
...
<VirtualHost _default_:80>
  ServerAdmin webmaster@name1.com
  DocumentRoot "C:/dat/www/name1.com/pub"
  CustomLog "c:/dat/www/logs/name1.com-access.log" combined
  ErrorLog "c:/dat/www/logs/name1.com-error.log
</VirtualHost>

<VirtualHost _default_:81>
  ServerAdmin webmaster@name2.com
  DocumentRoot "C:/dat/www/name2.com/pub"
  CustomLog "c:/dat/www/logs/name2.com-access.log" combined
  ErrorLog "c:/dat/www/logs/name2.com-error.log
</VirtualHost>
...

3.2 By DNS Names

httpd.conf:

...
Listen 80
...
NameVirtualHost *

<VirtualHost *>
  ServerName dev.name1.com
  ServerAdmin webmaster@name1.com
  DocumentRoot "C:/dat/www/name1.com/pub"
  CustomLog "c:/dat/www/logs/name1.com-access.log" combined
  ErrorLog "c:/dat/www/logs/name1.com-error.log
</VirtualHost>

<VirtualHost *>
  ServerName dev.name2.com
  ServerAdmin webmaster@name2.com
  DocumentRoot "C:/dat/www/name2.com/pub"
  CustomLog "c:/dat/www/logs/name2.com-access.log" combined
  ErrorLog "c:/dat/www/logs/name2.com-error.log
</VirtualHost>
...

hosts:

127.0.0.1 dev.name1.com
127.0.0.1 dev.name2.com

3.3 By DNS Names and Various Languages

httpd.conf:

...
<VirtualHost *>
  ServerName dev.edelfoto.com
  ServerAlias dev.www.edelfoto.com dev.de.edelfoto.com dev.en.edelfoto.com dev.es.edelfoto.com
  ServerAdmin webmaster@edelfoto.com
  DocumentRoot "C:/dat/www/edelfoto.com/pub"
  ErrorLog logs/edelfoto.com-error.log
  CustomLog logs/edelfoto.com-access.log combined
</VirtualHost>
...