A beginner-level lab write-up from the Security Blue Team course covering how to identify files with mismatched extensions using Linux CLI tools. Key techniques include using the `file` command to read magic bytes, `find` to locate files by name pattern, `ls -a` to reveal hidden dot directories, and combining `file` with `grep` to scan for disguised images. The lab walks through practical exercises: finding two disguised image files, decoding a hidden NATO phonetic alphabet message, locating a bank details file in subdirectories, counting true images including disguised ones, and retrieving a flag from a hidden `.Private` directory.
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