How can I add greater than and less than into a batch file variable

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忘了有多久
忘了有多久 2020-12-02 02:09

When I try

@echo off
set PTag=^
echo %PTag%

I get nothing.

Now what\'s interesting is that if there\'s an empty line aft

3条回答
  •  感动是毒
    2020-12-02 03:11

    set PTag=^ sets the value
    to PTag

    When you run echo %PTag% it expands to echo
    which is an invalid redirection. You need to escape the < and > inside PTag by using this

    set PTag=^^^
    

    The first ^ escapes itself, then the next one escapes < or >

    You can also use this

    set "PTag=^"
    

    Reason for the second way: inside quotes ^ loses its special meaning

    If it is a quote (") toggle the quote flag, if the quote flag is active, the following special characters are no longer special: ^ & | < > ( ).

    How does the Windows Command Interpreter (CMD.EXE) parse scripts?

    most special characters (^ & ( ) < > | and also the standard delimiters , ; = SPACE TAB) lose their particular meaning as soon as ther are placed in between "", and the "" themselves do not become part of the variable value

    Special Characters in Batch File


    Now the variable will have the value ^ inside it, and it'll expand echo %PTag% to

    echo ^
    

    which is a valid command

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