Line counts are something that bean counters that do not
understand software or rather quality software, use as a
metric to determine how efficient their programmers are.
I could quite easily pump out 1000 lines of crap code per
day, and then have to change half of them 3 times and
remove 30% to get to a predetermined level of quality,
or I can average 1/4 of that, and produce code that has
the requested level of quality from the start. Depending on
the size of the project I may not code anything for days
or weeks, while working through the design. Frequently the
well thought out design has fewer lines of code and also
has a higher level of quality (fewer lines of code usually
means fewer chances to make a mistake).
However, to really answer your question, if some bean counter
does ask for such a metric, I usually just give them a
wc -l, or possibly, if I'm trying to make them think I've
put some real work into the number, I have a script that
does a glorified wc -l, but has an impressive name, and
a hideous number of comand line switches and 'thinks' about
the result for about 45 seconds to a minute, and then
prints its result.
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