How to delete line if longer then XY?

Question

How can i delete a line, if it's longer then e.g.: 2048 chars?

Answer 1

sed '/^.\{2048\}..*/d' input.txt > output.txt

Answer 2

Here's a solution which doesn't use extended regular expressions:

sed '/^.\{2048,\}$/d' file.in >file.out

Answer 3

Something like this should work in Python.

of = open("orig")
nf = open("new",'w')
for line in of:         
    if len(line) < 2048:
        nf.write(line)
of.close()
nf.close()