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Extract content between the first " and the last " double quotes
Thanks to this user: https://stackoverflow.com/a/35636373/2394635

Remove all unused kernels with apt-get
This will remove all installed kernels on your debian based install, except the one you're currently using. From: http://tuxtweaks.com/2009/12/remove-old-kernels-in-ubuntu/comment-page-1/#comment-1590

Command to rename multiple file in one go
An entirely shell-based solution (should work on any bourne-style shell), more portable on relying on the rename command, the exact nature of which varies from distro to distro.

Search some text from all files inside a directory

Open a file explorer on a split screen inside your vim session
Open a CLI file explorer by splitting up your screen inside your vim session. Besides, you probably are never going to forget this one.

Rename files in batch

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

check open ports without netstat or lsof

Dump snapshot of UFS2 filesystem, then gzip it
Opens a snapshot of a live UFS2 filesystem, runs dump to generate a full filesystem backup which is run through gzip. The filesystem must support snapshots and have a .snap directory in the filesystem root. To restore the backup, one can do $ zcat /path/to/adXsYz.dump.gz | restore -rf -

python2 -m CGIHTTPServer
In case you need to test some CGI scripts this does the job. It also has the functionality of a http server. Enjoy!


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