Level 5-9

Levels from Level 5 to 9 focuses on basic techniques to find and sort things based on properties.

Level 5

This level requires us to find a file among files which is human readable, 1033 bytes in size and not executable. To do this we can use the find command.

                $ find * -size 1033c
                

In the above command, we sort using only 1033 bytes file size. Explore the rest of options by reading the man pages!

                $ man find
                

Level 6

This level is similar to the previous level, except here we sort on the basis of user, group and size.

                $ find / -user bandit7 -group bandit6 -size 33c
                

Level 7

This level requires us to find the password by finding the word millionth in the file.

                $ cat data.txt | grep "millionth"
                

Again, we use piping here. Where we take all the text and find the word millionth in the output which revals the password.

Level 8

This level requires us to find the line which occurs exactly only once. We could use the `uniq` command to find the line but there is one problem, uniq checks one word before and after the current word. So if the text is as follows:

                apple
                banana
                orange
                apple
                banana
                

Then uniq wont be able to identify the uniqe lines. So we first sort the file and then pipe the sorted output to uniq.

                $ sort data.txt | uniq -u
                

Why -u? Read the man pages!

Level 9

This level requires us to find a set of few human readable strings, preceeded by "=" characters. To accomplish this we would use the strings command which by default scans the file and returns any human-readble text string that is at least 4 characters long and end ends with a null or newline character.

                $ strings data.txt | grep "==="