empty variable when send to background using export

Question

I'm building a sitemap from mysql and to speed things-up I would like to send my function to the background. When I do so, the "$SITEMAP" variable appears empty.

what I've tried is setting export SITEMAP="$SITEMAP"

for ((i=0; i<CNT; i++)); do
    xml() {
        ...
        export SITEMAP="$SITEMAP"
    }
    xml &
    echo -e "$SITEMAP"
done

ps: without sending to background the "xml" function, script works correctly.

score 1 · Accepted Answer · edited May 23 '17 at 12:13

1

Because the background shell is a different process. The rest is explained e.g. here.

edited May 23 '17 at 12:13

Community

1
1

answered Mar 05 '13 at 16:16

Roman Cheplyaka

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score 1 · Answer 2 · answered Mar 05 '13 at 16:17

1

When you call

 xml &

you start a different process, then the export is valid only in the environement of the latter.

Remove the & and it will work

answered Mar 05 '13 at 16:17

Davide Berra

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empty variable when send to background using export

2 Answers2