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From André Warnier>
Subject Re: [OT] run tomcat as tomcat user
Date Sat, 24 Jan 2009 21:59:01 GMT
Rusty Wright wrote:
> I love shell script hacks so my /etc/init.d/tomcat script has the 
> following in the upper part where it's setting variables:
> TOMCAT_HOME=`grep ^tomcat /etc/passwd | sed -e 
> 's/.*:.*:.*:.*:.*:\(.*\):.*/\1/'`

You love shell scripts, but don't seem to love regexp's.

> Perhaps instead of .* I could have used [^:]*

Yes.  That alone will probably make you regexp about 10,000 times 
faster.  As first written, the first ".*" will match everything to the 
end of the string, but then fail to find the next ":".  So it will 
backtrack one character and try again.
When it has found the last ":", it will fail to match with the next 
".*", so it will backtrack.
And so on...
I don't think 10,000 does it justice. ;-)
I also don't think you want to escape the ().

On the other hand, I think "cut" might be your friend here.
grep "^tomcat" /etc/passwd | cut -d: -f 6

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