====== Windows common directory and app path ======

System configure tool and file
  * system property and variable settings (virtual ram, paging file) <code>SystemPropertiesAdvanced</code>
  * user system property <code>rundll32 sysdm.cpl,EditEnvironmentVariables</code>
  * hosts file <code>\Windows\System32\drivers\etc\hosts</code>
  * disk manager <code>diskmgmt.msc</code>
  * start up list<code>%userprofile%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup</code>
  * Boot and start-up list <code>msconfig</code>
  * control panels (path) <code>
# uninstall program
Control Panel\All Control Panel Items\Programs and Features
# pen and touch for windows
Control Panel\All Control Panel Items\Pen and Touch
# tablet settings for windows
Control Panel\All Control Panel Items\Tablet PC Settings
# network location
Control Panel\Network and Internet\Network Connections
# network connection
Control Panel\All Control Panel Items\Network and Sharing Center
</code>

System app

====== Mac OS X common directory and app path ======

System configure tool and file
  * system property and variable settings
  * hosts file <code>\etc\hosts</code>
  * disk manager <code>open -a /Applications/Utilities/Disk\ Utility.app</code>
  * activity monitor <code>open -a Activity\ Monitor</code>
  * script editor <code>open -a script\ editor</code>
  * caculator <code>open -a calculator</code>
  * control panels <code>open -a system\ preferences</code>

**Startup directory**
   * <code bash>/Library/StartupItems
/System/Library/StartupItems

# structure demo
# MyStartupItem/
#    MyStartupItem
#    StartupParameters.plist
# ref: http://developer.apple.com/library/mac/#documentation/MacOSX/Conceptual/BPSystemStartup/Articles/StartupItems.html
    
# example
sudo vi myStartRun/myStartRun
sudo vi myStartRun/StartupParameters.plist
# optional: sudo vi myStartRun/Resources/English.lproj 
sudo chown -R root myStartRun/
sudo chgrp -R wheel myStartRun/
sudo chmod 755 myStartRun/myStartRun
# the plist template
</code> <code xml>
<?xml version=”1.0? encoding=”UTF-8??>
<!DOCTYPE plist SYSTEM “file://localhost/System/Library/DTDs/PropertyList.dtd”>
<plist version=”0.9?>
<dict>
<key>Description</key>
<string>__MyScriptName__</string>

<key>OrderPreference</key>
<string>Late</string>

<key>Provides</key>
<array>
<string>whatever</string>
</array>

<key>Uses</key>
<array>
<string>SystemLog</string>
</array>
</dict>
</plist>
</code>
ref:http://www.kharysharpe.com/2011/04/automatically-starting-xampp-on-mac-osx-boot-up/

**Startup script (not working after Tiger OSX)**
   * <code bash>/var/root/Library/Preferences/com.apple.loginwindow

sudo defaults write com.apple.loginwindow LoginHook /path/to/script
sudo defaults write com.apple.loginwindow LogoutHook /path/to/script 
</code>
ref: http://hintsforums.macworld.com/showthread.php?t=39095


====== Linux common directory and app path ======

  * start-up directory with different admin level<code>/etc/rc.d
/etc/rc0.d /etc/rc1.d /etc/rc2.d /etc/rc3.d /etc/rc4.d /etc/rc5.d /etc/rc6.d</code>
  * start-up directory <code bash>/etc/init.d/</code>
    * initialize rc <code bash>/etc/init.d/rc</code>
  * start-up script: put your cmd here to run at start-up<code bash>/etc/rc.local</code>

ref: http://luv.asn.au/overheads/linux-startup.html

^  Run Level  ^  Generic  ^   Fedora Core   ^
|0|Halt|Halt|
|1|Single-user mode|Single-user mode|
|2|Basic multi-user mode (without networking)|User definable (Unused)|
|3|Full (text based) multi-user mode|
|4|Not used|Not used|
|5|Full (GUI based) multi-user mode|Full multi-user mode (with an X-based login screen) - default runlevel|
|6|Reboot|Reboot|

  * run that level <code bash>init 6</code>
  * runlevel config <code bash>/etc/inittab</code>
  * task manager <code bash>ps aux
top
ps -A

# ref: http://www.cyberciti.biz/faq/show-all-running-processes-in-linux/
</code>
====== Ref Table ======
^ Variable ^ Windows XP ^ Windows Vista/7 ^ Mac OS X ^ Linux ^
| %ALLUSERSPROFILE% (%PROGRAMDATA%) | C:\Documents and Settings\All Users | C:\ProgramData | ? | ? |
| %APPDATA% | C:\Documents and Settings\{username}\Application Data | C:\Users\{username}\AppData\Roaming | ? | ? |
| %COMPUTERNAME% | {computername} | {computername} | ? | ? |
| %COMMONPROGRAMFILES% | C:\Program Files\Common Files | C:\Program Files\Common Files | ? | ? |
| %COMMONPROGRAMFILES(x86)% | C:\Program Files (x86)\Common Files | C:\Program Files (x86)\Common Files | ? | ? |
| %COMSPEC% | C:\Windows\System32\cmd.exe | C:\Windows\System32\cmd.exe | ? | ? |
| %HOMEDRIVE% | C: | C: | ? | ? |
| %HOMEPATH% | \Documents and Settings\{username} | \Users\{username} | ? | ? |
| %LOCALAPPDATA% | [NOT AVAILABLE] | C:\Users\{username}\AppData\Local | ? | ? |
| %LOGONSERVER% | \\{domain_logon_server} | \\{domain_logon_server} | ? | ? |
| %PATH% | C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;{plus program paths} | C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;{plus program paths} | ? | ? |
| %PATHEXT% | .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.WSF;.WSH | .com;.exe;.bat;.cmd;.vbs;.vbe;.js;.jse;.wsf;.wsh;.msc | ? | ? |
| %PROGRAMFILES% | C:\Program Files | C:\Program Files | ? | ? |
| %PROGRAMFILES(X86)% | C:\Program Files (x86) (only in 64-bit version) | C:\Program Files (x86) (only in 64-bit version) | ? | ? |
| %PROMPT% | Code for current command prompt format. Code is usually $P$G | Code for current command prompt format. Code is usually $P$G | ? | ? |
| %SystemDrive% | C: | C: | ? | ? |
| %SystemRoot% | The Windows directory, usually C:\Windows, formerly C:\WINNT | C:\Windows | ? | ? |
| %TEMP% and%TMP% | C:\Documents and Settings\{username}\Local Settings\Temp | C:\Users\{username}\AppData\Local\Temp | ? | ? |
| %USERDOMAIN% | {userdomain} | {userdomain} | ? | ? |
| %USERNAME% | {username} | {username} | ? | ? |
| %USERPROFILE% | C:\Documents and Settings\{username} | C:\Users\{username} | ? | ? |
| %WINDIR% | C:\Windows | C:\Windows | ? | ? |
| %PUBLIC% | C:\Users\Public | ? | ? |
| %PROGRAMDATA% | Only available in Windows Vista and newer versions | C:\ProgramData | ? | ? |
| %PSModulePath% | %SystemRoot%\system32\WindowsPowerShell\v1.0\Modules\ | ? | ? |
| hosts | %systemroot%\system32\drivers\etc\hosts | %systemroot%\system32\drivers\etc\hosts | /etc/hosts | /etc/hosts |