Commands by mohamednasr2000 (1)

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randomize hostname and mac address, force dhcp renew. (for anonymous networking)
this string of commands will release your dhcp address, change your mac address, generate a new random hostname and then get a new dhcp lease.

Stop Flash from tracking everything you do.
Brute force way to block all LSO cookies on a Linux system with the non-free Flash browser plugin. Works just fine for my needs. Enjoy.

Get last sleep time on a Mac
Similarly for last wake time: $ sysctl -a | grep waketime

Check for login failures and summarize
This command checks for the number of times when someone has tried to login to your server and failed. If there are a lot, then that user is being targeted on your system and you might want to make sure that user either has remote logins disabled, or has a strong password, or both. If your output has an "invalid" line, it is a summary of all logins from users that don't exist on your system.

Adhoc tar backup
Creates a quick backup with tar to a remote host over ssh.

Convert mysql database from latin1 to utf8
MySQL: CHARSET from latin1 to utf8

Find the package that installed a command

List all the files that have been deleted while they were still open.
If your customer deletes a file that is still in use by a process, that space does not get freed up (will not show up in df) until that process either closes the file on its own, or is killed.

Simple Comment an entire file
With this simple sed command we can easily comment and entire file.

Show exit status of all portions of a piped command eg. ls |this_doesn't_exist |wc


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