Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
In Linux, files whose names start with "." (dot) are "hidden files" and are not displayed with the regular ls command. There seems to be a hidden file on the server. Try to find it!
Use `ls -la` to show hidden files too
Look for files starting with "."
There's a file called `.secret`. Check its contents with `cat .secret`