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here is the example how you do it with normal variables:
SET _test=123456789abcdef0
SET _result=%_test:~-7%
ECHO %_result%
:: that shows: abcdef0
But what to do with variables with double percent at the begin (like %%A), variables like this are needed in for loops:
FOR /D %%d IN (c:\windows\*) DO (
echo %%d
)
this works, but:
FOR /D %%d IN (c:\windows\*) DO (
echo %%d:~-7%
)
simply copies :~-7 into the echo command
232
Use double percent signs ( %% ) to carry out the for command within a batch file. Variables are case sensitive, and they must be represented with an alphabetical value such as %a, %b, or %c. ( <set> ) Required. Specifies one or more files, directories, or text strings, or a range of values on which to run the command.
By default, /F breaks up the command output at each blank space, and any blank lines are skipped.
To reference a variable in Windows, use %varname% (with prefix and suffix of '%' ). For example, you can use the echo command to print the value of a variable in the form " echo %varname% ".
The replace and substring syntax only works for variables not for parameters.
But you can simply copy the parameter into a variable and then use the substring syntax.
setlocal EnableDelayedExpansion
FOR /D %%d IN (c:\windows\*) DO (
set "var=%%d"
echo !var:~-7!
)
You need here the delayed expansion, as a normal %var% would be expanded while parsing the complete block, not at execution time.
Or you could use the call technic, but this is very slow and have many side effects.
FOR /D %%d IN (c:\windows\*) DO (
set "var=%%d"
call echo %%var:~-7%%
)
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