Thanks; good point about the speedup by not using .* (although since this is in
a boot script, in this case it shouldn't really matter much). The \( \) is the
grouping thing where what matches in it is then substituted for as the \1 on
the right hand side. Cut is one of those commands I never remember to use,
same with xargs.
André Warnier wrote:
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.
export CATALINA_BASE=${TOMCAT_HOME}
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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