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
All challenges
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Linux-01. Grep the Needle Out of the Log Pile
Mission
Under /var/log/app there are many date-stamped log files, and the flag is hidden in a single ERROR line among them. Use grep or find to locate that line.
Hints
Hint 1 Show
grep -r can recursively search an entire directory
Hint 2 Show
Try filtering by log level (ERROR/DEBUG/INFO)
Hint 3 Show
grep -rn also shows the filename and line number