Skip download if files exist in wget?

Question

This is simplest example running wget:

wget http://www.example.com/images/misc/pic.png

but how to make wget skip download if pic.png

Answer 1

When running Wget with -r or -p, but without -N, -nd, or -nc, re-downloading a file will result in the new copy simply overwriting the old.

So adding -nc will prevent this behavior, instead causing the original version to be preserved and any newer copies on the server to be ignored.

See more info at GNU.