batch echo pipe symbol causing unexpected behaviour

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There are several special characters that generally must be escaped when used in Windows batch files. Here is a partial list: < > & | ^ %

The escape character is ^. So to get a literal |, you should do this:

echo ^|

When the special character is in a variable, it becomes a bit harder. But if you use special syntax, you can replace characters in a variable like this:

set X=A^|B

REM replace pipe character with underscore
set Y=%X:|=_%

echo %Y%
REM prints "A_B"

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