cmd - Batch - Right String in foor Loop with variable -

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i've little problem right string manipulation in loop. code in question:

set filename=!filename:~0,%lengthtoclip%!

if try without loop or replace variable %lengthtoclip% fix number works fine. need for-loop. processed text file line line, cut out unimportant information (the code fragment) on right side , write in new text file.

my first idea need ist stronger exclamation mark stronger %. i'm newbie batch have no idea how resolve problem. grateful help.

greetings

for %%z in ("!lengthtoclip!") set "filename=!filename:~0,%%~z!"

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