Linux: plz, explain well.

1. What is the command or commands that will show you all the login attempts for your username? Please write the commands and copy the output. 2. Using the dmesg command, show only the messages relating to warnings and errors. Also ensure the output is using a human readable time format. To verify that only error and warning messages are being show what option of dmesg would you use? Show both commands that were used. 3. What command would you use to display free disk space? List the command and its output.