Remove everything from a text file between ":" and "\n" – unix.stackexchange.com

Remove everything from a text file between ":" and "\n" – unix.stackexchange.com

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I have a big text file (263 lines) that contains lines something like these: image_name.jpg: *lots of spaces* JPEG image data, JFIF standard 1.01, resolution (DPI), density 96x96, segment length 16, ...

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