On 2008-07-23, Richard Neill wrote:
> At the moment, variables set within a subshell can never be accessed by
> the parent script. This is true, even for an implicit subshell such as
> caused by read.
The subshell is caused by the ipe, not by read.
> For example, consider the following (slightly contrived example)
>
> ------------
> touch example-file
> ls -l | while read LINE ; do
> if [[ "$LINE" =~ example-file ]]; then
> MATCH=true; [a]
> echo "Match-1"
> fi ;
> done
> if [ "$MATCH" == true ] ;then [b]
> echo "Match-2"
> fi
> ---------------
>
>
> This prints "Match-1", but does not print "Match-2".
touch example-file
ls -l | {
while read LINE ; do
if [[ "$LINE" =~ example-file ]]; then
MATCH=true;
echo "Match-1"
fi
done
if [ "$MATCH" == true ] ;then
echo "Match-2"
fi
}
--
Chris F.A. Johnson, webmaster <http://Woodbine-Gerrard.com>
===================================================================
Author:
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
