Clear it in 3 steps
Start the environment
Investigate the target
Submit the flag
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Linux-Pipeline. Narrowing Down Logs with grep and awk
Mission
The access log contains many lines, several of which include the flag. Chain commands together with pipes (|) to extract only the lines you need.
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Hints
Hint 1Show
First filter lines containing "FLAG" with grep
Hint 2Show
awk can extract just a specific field (column)
Hint 3Show
Chain commands with pipes like grep | awk | sort | uniq