unix command to truncate file contents

Question

can someone help me with unix command to truncate the contents of the files in the directory. I am using Cygwin in windows.

Answer 1

Just redirect from nowhere:

> somefile.txt

Answer 2

If you want to truncate a file to keep the n last lines of a file, you can do something like (500 lines in this example)

mv file file.tmp && tail -n 500 file.tmp > file && rm file.tmp

Answer 3

for file in *
do
  >$file
done