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What Linux command makes a guess about the content of a file without displaying the content?

Answer:

The command file will display what the type of the file is, even if it does not have a file extension. For example:

user@hostname:~$ file image.png
image.png: PNG image data, 639 x 480, 8-bit/color RGB, non-interlaced
user@hostname:~$ file picture
picture: JPEG image data, JFIF standard 1.01, comment: "CREATOR: gd-jpeg v1.0 (using IJ"

First answer by Idisjunction. Last edit by Idisjunction. Contributor trust: 807 [recommend contributor recommended]. Question popularity: 1 [recommend question].

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