I'm unfamiliar with those. How would you do the equivalent of what I did, with @B...? How do you delete the lines from the original after appending them to a new file?

I grab a line from a text file to a variable and output it to another. Example: DO line IN @file1.txt echo %line >> file2.txt ENDDO It has a problem: special characters like " ` < > | and long lines (is there a variable length limit?) are not appended to the file but are printed on...