Re: Bash bug?

[Greg Wooledge]

On Tue, Jan 24, 2023 at 06:27:28PM +0800, Po Lu wrote:
> mapfile "-d " -t FOO <<<"1 2 3" ; for i in "${FOO[@]}"; do echo
> "x${i}x"; done
> 
> gives:
> 
> x1x
> x2x
> x3
> x
> 
> but since I specified -t, I would have expected that the delimiter be
> removed from the end of each delimited input ``line''.

You specified that the delimiter is a space, and the spaces were removed
from each element.  However, the <<< operator adds a newline to the
input stream, and the newline character is NOT the delimiter you asked
for, so it's NOT removed.

If you want to send an input stream without adding a newline to it, you
can use < <(printf %s "$var") instead of <<< "$var".