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Backup all MySQL Databases to individual files

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Burn an ISO on the command line.

Sort disk usage from directories
Sort disk usage from directories in the current directory

sends your internal IP by email
This is useful if you have need to do port forwarding and your router doesn't assign static IPs, you can add it to a script in a cron job that checks if you IP as recently changed or with a trigger script. This was tested on Mac OSX.

Create POSIX tar archive
tar(1) and cpio(1) are not fully platform agnostic, although their file formats are specified in POSIX.1-2001. As such, GNU tar(1) might not be able to extract a BSD tar(1) archive, and ivce versa. pax(1) is defined in POSIX.1-2001. To extract an archive: $ pax -rf archive.tar

show lines that appear in both file1 and file2

Send your svn diff to meld
If you like to view what has been changed between revision 100 and the BASE on FILE. Meld will give you a nice overview.

Show the last 20 sessions logged on the machine
change 20 by the number of sessions you want to know (20 it's fair enough)

list files recursively by size


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