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Note that some systems might not allow to recycle passwords, i.e. restore the original one within a certain amount of time or a certain amount of password changes, or both.
2.5.3. Directories
These are some exercises to help you get the feel.
• Enter the command cd blah
-> What happens?
• Enter the command cd ..
Mind the space between "cd" and ".."! Use the pwd command.
-> What happens?
• List the directory contents with the ls command.
-> What do you see?
-> What do you think these are?
-> Check using the pwd command.
• Enter the cd command.
-> What happens?
• Repeat step 2 two times.
-> What happens?
• Display the content of this directory.
• Try the command cd root
-> What happens?
-> To which directories do you have access?