On Thu, 04 Apr 2013 08:54:30 -0500, Teske, Devin
<[email protected]> wrote:
Wait, you can't? Then I've been doing something wrong all these years…
#!/bin/sh
printf "line1\nline2\n" | while read line
do
echo "line=[$line]"
done
You sort-of can, but it's not portable at all. As detailed here:
http://www.etalabs.net/sh_tricks.html
One common pitfall is trying to read output piped from commands, such
as:
foo | IFS= read var
POSIX allows any or all commands in a pipeline to be run in subshells,
and which command (if any) runs in the main shell varies greatly between
implementations — in particular Bash and ksh differ here. The standard
idiom for overcoming this problem is to use a here document:
IFS= read var << EOF
$(foo)
EOF
I was having problems with the variables magically becoming empty,
remembered I had Rich's site bookmarked, checked to see if it mentioned
and it was. I'll admit there's a high chance that due to lack of sleep
user error was the culprit.
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