I keep getting a syntax error complaint and I can't find out why:
cls
set a=.\Data\%Last%.ejl
echo ID: %id% > %a%
echo Last Name: %Last% >> %a%
echo First Name: %First% >> %a%
echo Gender:%Gender% >> %a%
echo Birthday:%Birthday% >> %a%
echo Relation: >> %a%
echo %Relation% >> %a%
This may work for you - if %last% doesn't contain various odd characters.
Some foreign characters are not rendered properly in the default code page.
cls
(
echo ID: %id%
echo Last Name: %Last%
echo First Name: %First%
echo Gender:%Gender%
echo Birthday:%Birthday%
echo Relation:
echo %Relation%
) >".\Data\%Last%.ejl"
Wild guess in the absence of information: the variable last contains spaces or some "poison" character (those that are significant to cmd).
Cure: set the target file to "%a%" not %a%. The enclosing quotes ensures batch interprets Space as an ordinary character, not a separator.
To assign a string to a variable, try using set "string=variable text" - the enclosing quotes ensure that any trailing spaces on the line are not included in the value assigned.
Note also that any spaces on either side of the = in a string-set statement will be included - either in the variablename or the string assigned.
Note also that your design appears to have a problem - what happens where there is more than one "lastname" in your list - John Doe and Jane Doe?
