How to remove leading whitespace from each line in a file

Question

I have a file that looks something like this:

for (i = 0; i < 100; i++)
    for (i = 0; i < 100; i++)
  for (i = 0; i < 100; i++)
       for (i = 0;         


        

Answer 1

sed "s/^[ \t]*//" -i youfile

Warning: this will overwrite the original file.