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Using a single sudo to run multiple && arguments
This will also work with bash instead of sh shell sudo bash -c 'apt update -y && apt upgrade -y'

Convert all JPEG images to MP4
Source: http://superuser.com/a/624574

Merge Multiple PDFs
Merge Multiple PDFs In Alphabetical Order

Check whether laptop is running on battery or cable
If you want to do the same in OS X... grep as necessary for information you need....

Blacklist usb storage
Some times you may ban usb to protect thefting of your personal data. Blacklist the usb_storage module by adding blacklist usb_storage to /etc/modprobe.d/blacklist.conf. To load the module manually, $sudo modprobe usb_storage.

tail -f a log file over ssh into growl

list block devices
Shows all block devices in a tree with descruptions of what they are.

print code 3-up and syntax-highlighted for easy beach-time study
This is the setup I'm using for my largest project. It gives 357 lines per page (per side), which makes it fairly easy to carry around a significant amount of code on a few sheets of paper. Try it. (I stick to the 80 column convention in my coding. For wider code, you'll have to adjust this.)

run command on a group of nodes in parallel
Parallel is from https://savannah.nongnu.org/projects/parallel/ Other examples would be: (echo foss.org.my; echo www.debian.org; echo www.freenetproject.org) | parallel traceroute seq -f %04g 0 9999 | parallel -X rm pict{}.jpg

Top Command in batch mode
running top command in batch mode. it is usefull if you want to redirect the output in a file.


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