Using gzip to compress a file without overriding it

Posted on December 25, 2018 by Ahmed Tawfik 
gzip < source_file > compressed_file.gz

Source:

https://unix.stackexchange.com/questions/46786/how-to-tell-gzip-to-keep-original-file

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Resize root filesystem on Ubuntu 18.04 with LVM

Posted on December 24, 2018 by Ahmed Tawfik

Ubuntu 18.04 default lvm layout comes with only a 4 GB root partition. Here we will extend it to occupy the full free space in the volume group:

sudo lvextend -l 100%FREE --resizefs /dev/ubuntu-vg/ubuntu-lv

That’s it, Enjoy!

Sources:

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How to scan for devices in your network in Ubuntu

Posted on December 19, 2018 by Ahmed Tawfik 
sudo apt install arp-scan
sudo arp-scan -l --interface=wlp2s0

Replace wlp2s0 with your NIC’s name, works for both wireless and wired

Source:

https://askubuntu.com/questions/82480/how-to-see-all-computers-connected-to-a-network

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List network adapters connected to Ubuntu Server

Posted on December 11, 2018 by Ahmed Tawfik 
sudo ls /sys/class/net

Source: https://askubuntu.com/questions/296152/how-to-check-what-is-my-network-card-on-ubuntu

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Validate xml files with xmlstarlet on Ubuntu

Posted on December 9, 2018 by Ahmed Tawfik 
sudo apt install xmlstarlet
xmlstarlet val XML_FILE.xml
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