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Run a command if today is the last day of the month
This is handy to just shove into a daily cron entry. If you do use cron, make sure to escape the %d with \%d or it will fail.

recursive search and replace old with new string, inside files
This command find all files in the current dir and subdirs, and replace all occurances of "oldstring" in every file with "newstring".

Generate random valid mac addresses
Ruby version. Also, a perl version: $perl -e 'printf("%.2x.",rand(255))for(1..5);printf("%.2x\n",rand(255))'

Shell recorder with replay
If you provide the option -t to the script command and redirect stderr into a file, the timing information on what is going on on the terminal, is also stored. You can replay the session via the scriptreplay command, where you can also provide a speedup factor (see the man page for details). Great for demonstration purposes ...

Suspend to ram
No need to be root to do that. Relies on UPower (previously known as DeviceKit-Power).

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"

Using a single sudo to run multiple && arguments
Bash's here string

Display laptop battery information

Benchmark report generator
Nicely display in html format a detailed report of the machine, including cpu benchmarks.

Find usb device
I often use it to find recently added ou removed device, or using find in /dev, or anything similar. Just run the command, plug the device, and wait to see him and only him


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