On Fri, Mar 16, 2018 at 09:14:13AM -0400, Boruch Baum wrote: > In GNU bash, version 4.4.18(1)-release (x86_64-pc-linux-gnu), the first > line of the documentation for readarray / mapfile states: > > Read lines from the standard input ... > > However, it doesn't seem to accept input from a pipe. It would be > helpful to note that.
It does. What you're running into is the fact that each component of the pipeline is run in a separate subshell, so any variables assignments made during the pipeline (including read or mapfile) are lost once the pipeline is completed. https://mywiki.wooledge.org/BashFAQ/024 Demonstration: wooledg:~$ printf %s\\n one two | (mapfile -t array; declare -p array) declare -a array=([0]="one" [1]="two") wooledg:~$ declare -p array bash: declare: array: not found The "array" variable was created in a subshell, so it's gone once the pipeline has finished.
