TheBeArsenal

Linux - The Elite List

Create bootable USB using 'dd' command.

sudo dd bs=4M if=path/to/input.iso of=/dev/sd conv=fdatasync status=progress
Comment: Replace input file path and drive letter(sda/b/c). Use 'lsblk' if confused.
Source - https://askubuntu.com/a/377561

Install .deb file in Linux.

sudo dpkg -i /path/a.deb
Comment: Use 'sudo apt install -f' for any missing dependencies.
Source - https://unix.stackexchange.com/a/159114

Display the first few words of a file in Linux.

head -c 100 filename
Comment: Prints first 100 bytes of the file.
Source - https://unix.stackexchange.com/a/167816

Display last few words of a file in Linux.

tail -c 100 filename
Comment: Prints last 100 bytes of the file.
Source - https://unix.stackexchange.com/a/167816

Append words to the end of the file in Linux.

echo 'input' >> filename
Comment: Attachs the input to the file.
Source - https://www.cyberciti.biz/faq/linux-append-text-to-end-of-file/

Insert text into the begining of a file in Linux.

sed -i '1s/^/abcde /' filename
Comment: Attachs the input to the file beginning.
Source - https://stackoverflow.com/a/9533736/6903724

Kill a linux process by its name.

kill -9 $(ps -ef | grep "name" | grep -o "[0-9]*" | head -1)
Comment: 'ps -ef' will display all process, by using series of 'grep' and 'head' the PID of the corresponding process is obtained and later fed to kill command. 'kill -9' command cannot be blocked.

Cron job at random time

* */6 * * * sleep $[ ( $RANDOM % 60 ) + 1 ]m; /path-to-script
Comment: This cron job will run every 6 hours but is delayed by random minutes.

Less secure app issue - GMail, Geary

Follow the link - https://www.google.com/settings/security/lesssecureapps
Toggle button for 'Allow less secure apps'
Comment: By default Google blocks Geary integration for certain reasons.