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From: Christian Weisgerber <naddy@mips.inka.de>
Newsgroups: list.freebsd.questions
Subject: Re: Counter in sh inside loop, value "encapsulation"
Date: Wed, 4 Dec 2019 20:28:02 -0000 (UTC)
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On 2019-12-04, Polytropon <freebsd@edvax.de> wrote:

> #!/bin/sh
> COUNT=0
> grep "^https" ${INFILE} | while read URL; do
> 	COUNT=`expr ${COUNT} + 1`
> done
> echo "URLs processed: ${COUNT}" # <--- (!) THIS IS ZERO!

Each command of a pipeline is executed in a subshell.
(Some shells, notably AT&T ksh, behave differently.)

This is the single most asked shell scripting question.

-- 
Christian "naddy" Weisgerber                          naddy@mips.inka.de