why the perl one-liner not run with variable input files

Have the following code block
set WKDIR=D:\TEMP\
set _out1=%WKDIR%\test2.txt
set _in1=%WKDIR%\test1.txt
perl -lne "$lines{ $_ }++; END{ print for sort keys %lines }"  %_in1% > %_out1%
I got the error:
----
Missing right curly or square bracket at -e line 1, at end of line
syntax error at -e line 1, at EOF
Execution of -e aborted due to compilation errors.
----------------
but when I did the following
----------------
d:
cd D:\TEMP
perl -lne "$lines{ $_ }++; END{ print for sort keys %lines }"  test1.txt > test2.txt
----------------
I can get the right result without errors.
-------------
D:\TEMP>type test1.txt
WWW
AB_C
ABB
ACB
ABB
XYZ
123
-------
jl66Asked:
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Steve KnightIT ConsultancyCommented:
I don't know perl but could this be due to using %lines and then not ending it with another % so it doesn't terminate the variable name?

Steve
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Steve KnightIT ConsultancyCommented:
Probably not that.... but actually you have an extra \ in there.... one on the end of wkdir and one on beginning of other two...
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willettmeisterCommented:
actually you may not have enough remember \ is a special character in perl try this
set WKDIR=D:/TEMP
set _out1=%WKDIR%/test2.txt
set _in1=%WKDIR%/test1.txt

or this
set WKDIR=D:\\TEMP
set _out1=%WKDIR%\\test2.txt
set _in1=%WKDIR%\\test1.txt
0
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ozoCommented:
I don't get that error.
Are you sure you are enclosing the command in quotes?
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jl66Author Commented:
willettmeister, I tried your suggestions. I got the error messages. Also I rtied to run the same perl on different servers, I got the same. What is wrong with that.
Why don't the other one-liners have this kind of issues? ozo, I copied/pasted the code here. The quotes are here.
 
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jl66Author Commented:
dragon-it, thanks for pointing out this, but it does not make any difference.
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Adam314Commented:
The problem is the % in %lines in a batch file.  The % is a special character to batch files, so it gets interpreted along with the closing } and closing ".  This causes the syntax error.  To fix, you need to use two percent signs where you need one.
perl -lne "$lines{ $_ }++; END{ print for sort keys %%lines }"  %_in1% > %_out1%

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ozoCommented:
Is this running from a .bat file?
What if you try


set WKDIR=D:\TEMP\
set _out1=%WKDIR%\test2.txt
set _in1=%WKDIR%\test1.txt
set lines=%lines
perl -lne "$lines{ $_ }++; END{ print for sort keys %lines% }"  %_in1% > %_out1%


or
perl -lne "$lines{ $_ }++; END{ print for sort keys %%lines }"  %_in1% > %_out1%
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