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Start the environment
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Investigate the target
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Linux-File Type Disguise. Unmasking Files with the file Command
Mission
A file with a .jpg extension may actually contain plain text. Use the file command to spot files whose extension does not match their real content.
Hints
Hint 1 Show
The file command determines the real format from the file's content (magic bytes)
Hint 2 Show
Don't trust the extension — check every file with file
Hint 3 Show
Use a wildcard like file * to check them all at once