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I was operating under the incorrect assumption that lookarounds were universal. Thank you both for your help and responses!

I am using ubuntu 14.04. Thanks! The -o option was a big part of what I was looking for. Thank you!

Currently, I'm getting http://site.com/image/word/tag/funny"><img...

I'm trying to pull an image source url from a html source file. I'm new with regex. I'm in BaSH. I've tried grep -E 'http.*jpg' file which highlights the text, but gives me 2 problems:

1)...

2) Catenate file1.txt and delete first and last line.

You are correct - original post updated to reflect that.

Have you tried links? I'm not sure if links2 (somewhat graphical) will run on unix (I'm using linux), but I'm impressed with it not needing a GUI. As a sidenote, the text works great, but the...

$ps -u root --no-header | wc -l