Date: Wed, 4 Dec 2019 20:28:02 -0000 (UTC) From: Christian Weisgerber <naddy@mips.inka.de> To: freebsd-questions@freebsd.org Subject: Re: Counter in sh inside loop, value "encapsulation" Message-ID: <slrnqug5mi.srf.naddy@lorvorc.mips.inka.de> References: <20191204181300.8dd0e03c.freebsd@edvax.de>
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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
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