How do I delete all lines with ".png" in a file?

Question

I've a list of urls of which some point to images:

http://s.thebrighttag.com/iframe?c=A5lqOqP
http://s.wordpress.com/imgpress?resize=136,136&url=http%3A%2F%2Fdata.whicdn.com%2Fimages%2F2833524%2F4thofJuly-collage_large.jpg%3F1278084193

How do I remove those lines from the file?

Answer 1

cat file | grep -v "\.png" >new_file_without_pngs

Updated for comment:

egrep -iv "\.(png|jpg|jpeg|gif|etc)" file >new_file

Answer 2

For the in-place editing variant, you can use sed like the following:

$ sed -i -r 's/.*\.(png|jpg).*//I' file

It will remove the lines containing either .png or .jpg directly in the file. The -i option passed to sed means 'in-place editing'. Make a backup of your file before executing this command, or try it first without the -i option if you are unsure.

The I flag is to perform a case-insensitive matching.

Answer 3

You can use Vim in Ex mode:

ex -sc 'g/\.png/d' -cx file

1. g global search

2. d delete

3. x save and close

Answer 4

If you have sponge you can swap out the contents of a file in place like this:

grep -E -iv "\.(png|jpg|jpeg|gif)" file | sponge file