batch echo pipe symbol causing unexpected behaviour

Question

I have a variable in my batch file and it contains the pipe symbol (this one: |) so when I echo the variable I get an error about a unrecognized internal/external command.

Answer 1

set X=%0^|callset.bat
set Y=%X:|=_%
echo %Y%
echo %X% _ %Y%
REM activate callset | more

REM and you should have infinite pipe. Break CTRL+C twice Ctrl Break REM prints "The process tried to write to a nonexistent pipe."