Combine your skills to accomplish a real-world challenge—help your system administrator track down a hacker.
(logo whooshes)…- [Instructor] One of the common ways…hackers try to break into computers…is by attempting to log in remotely…with randomly generated usernames, or the names…commonly used by popular services.…The service that monitors logins…writes information about connection attempts…to the system log file.…So while this kind of activity is going on…we have a record of these attempts.…In the exercise files there's an archive called log.tar.gz…and it contains a log file…with a lot of attempted connections.…
Here's a challenge to help you practice…what I've shown you so far, your task is to extract the file…so you can work with it as text, and to look for lines…containing invalid user authorization requests.…Then use what you've learned to create a file…containing the usernames our would-be attacker…tried to use to login.…Remember to use the tools you've learned about…to browse through text, to rearrange text programmatically…and to make use of piping and output redirection.…Try to organize the output alphabetically too.…
- Recognize what the characters “-h” represent in the statement “df –h/home/alice/Documents”.
- Explain how to recall a previous command in Bash.
- Identify what the command “ls -l” will show.
- Recall what is needed to use the find command to look for files by name, size, and so on.
- List the two modes file permissions can be set to.
- Recall why many command line tools are intended to be used in pipes with other commands.
- Explain what the command “grep -E "" report.txt” will show.
- Identify what the “>” symbol is often used for.
Skill Level Beginner
Learning SQL Server Development on Linuxwith Joey D'Antoni1h 54m Intermediate
What you should know1m 51s
1. Setting Up Your Environment
2. Command-Line Basics
3. Files, Folders, and Permissions
4. Common Command-Line Tasks and Tools
5. A Peek at Some More Advanced Topics
Next steps1m 28s
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