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Subject: Re: Counter in sh inside loop, value "encapsulation"
To: Polytropon <freebsd@edvax.de>, freebsd-questions@freebsd.org
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From: Arthur Chance <freebsd@qeng-ho.org>
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On 05/12/2019 06:35, Polytropon wrote:
> For further reference, the simple solution is always the best one.
> I now have the following:
> 
> 	COUNT=0
> 	for URL in `grep "^https" ${INFILE}`; do
> 		process ${URL}
> 		if [ $? -eq 0 ]; then
> 			COUNT=`expr ${COUNT} + 1`
> 		fi
> 	done
> 	echo "URLs processed: ${COUNT}"
> 
> There now is no piping step (and therefore no subshell) involved.
> This works and can be easily extended (more preprocessing from
> the input list file).
> 
> I have no idea why I didn't think of this in the first place... :-)
> 

A minor point: you can replace

	COUNT=`expr ${COUNT} + 1`

with

	COUNT=$((COUNT + 1))

to use arithmetic expansion rather than spawning a subshell for the
backticks.

-- 
What do we want?
A time machine!
When do we want it?
Errm ...