Clear it in 3 steps
Start the environment
Investigate the target
Submit the flag
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Linux-Environment Variable Basics. Checking Shell Startup Variables
Mission
One of the environment variables set when the shell starts holds the flag. Check it with the env command or echo $variablename.
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Hints
Hint 1Show
The env command lists all current environment variables
Hint 2Show
echo $variablename shows the value of a specific variable
Hint 3Show
Look for a variable named SECRET_FLAG