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Comment by susi22 | Hacker News Reader

Ah Mathematica:

    $ curl -s http://4.bp.blogspot.com/-MPv_CwvvwKQ/Ulrw3TfdgyI/AAAAAAAAAEw/YsRPmU6C5xM/s1600/trefoil_rotate_white.gif |strings|grep -i created
    UCreated by Wolfram Mathematica 9.0 for Students - Personal Use Only : www.wolfram.com

Would love to see the source for them.

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Upvote for teaching me the "strings" command :) Never heard of that one before! Seems really useful.

If you're wanting metadata, consider exiftool also:

    $ curl -s http://4.bp.blogspot.com/-MPv_CwvvwKQ/Ulrw3TfdgyI/AAAAAAAAAEw/YsRPmU6C5xM/s1600/trefoil_rotate_white.gif | exiftool -

Output contains:

    Comment : Created by Wolfram Mathematica 9.0 for Students - Personal Use Only : www.wolfram.com

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