`docker run` output to bash variable - strange behaviour

Question

I'm seeing some strange behaviour getting the output from docker run into a bash variable.

Simple example:

#!/bin/bash

PWD=$(docker run --rm -ti ubuntu pwd 2>&1)
# also tried with PWD=`docker run ...` with same behaviour
echo $PWD
echo abc $PWD
echo abc $PWD xyz

output

/
abc /
 xyz/

The problem is on the last echo...

Answer 1

you need to modify the docker run --rm -ti ubuntu pwd 2>&1 with docker run --rm ubuntu pwd 2>&1 probabilly the interactive and tty mode doesn't work fine in a shell variables