[H-GEN] Useful not so obvious tips

[Adrian Sutton]

The most useful thing I've ever discovered on UNIX systems is &&.  
Mostly I use it as:

javac Test.java && java Test

which compiles the code and then runs it but if the compile fails the 
code isn't run.  Also useful is:

/Library/Tomcat/bin/shutdown.sh && /Library/Tomcat/bin/startup.sh

since Tomcat doesn't provide a restart script.  There's plenty of other 
occasions where you want to perform two or more commands one after the 
other.  The one downside I've hit was yesterday I accidently typed:

rm -rf /Library/Tomcat/webapps/JSPWiki /Library/Tomcat/bin/shutdown.sh 
&& /Library/Tomcat/bin/startup.sh

and had to restroe shutdown.sh from backup.

Regards,

Adrian Sutton.
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