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Computes total size of files in a directory. This value is different "du -b" because doesn't includes directory sizes.
I can't put the last ^2 with seq, so I reverse it to delete the last +N. So for doing sum(N^2) you have to do sum((N+1)^2). Must be a better way.
In the file data.txt there is a single column of numbers. Sed adds a "+" between lines and xargs prepares the output for bc. The "echo 0" is to avoid to have a "+" at the beginning of the line.
To get your effective user:
Loads file content on clipboard. Very useful when text selection size is higher than console size.
Not sure if it works the same on any shell.
Create a file with actual date as filename
Returns logs between HH:M[Mx-My], for example, between 13:40 and 13:45.
Uses date to grep de logfile for today and uses it to get the last hour logs. Can be used to get last minute logs or today's logs.
Extracts ip addressess from file using sed. Uses a tag(ip) to grep the IP lines after extracting. Must be a way to just output regex matched on sed.
This way you keep the file compressed saving disk space.
Other way less optimal using named pipes:
mysql -uroot -p'passwd' database <