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Top Forums Shell Programming and Scripting Strange behavior with readarray (aka mapfile) Post 302783747 by Don Cragun on Thursday 21st of March 2013 01:15:28 AM
Old 03-21-2013
Quote:
Originally Posted by Michael Stora
Code:
$ readarray list <<< "a b c d e f g"
$ echo ${list[@]}
a b c d e f g

$ echo "a b c d e f g" | readarray list2
$ echo ${list2[@]}
a blank line

I read a post the same thing happens with cat vs < on another forum but the poster did not know why.

Any ideas?

Mike
When you have a pipeline, the standards allow (but do not require) the elements of the pipeline to be in different shell execution environments. If your system does put them in different shell execution environments, the readarray may be setting list2 in one shell execution environment, but not in the environment where the second echo is running. If that is your problem, the following should work:
Code:
echo "a b c d e f g" | ( readarray list2
echo ${list2[@]} )

I'm running on OS/X, which does not have a readarray command. So, I can't test it, but hopefully this will give you some hints that may help.
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