Category Archives: Linux

Resize root filesystem on Ubuntu 18.04 with LVM

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: https://access.redhat.com/solutions/44089 https://www.digitalocean.com/community/tutorials/how-to-use-lvm-to-manage-storage-devices-on-ubuntu-18-04

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How to scan for devices in your network in Ubuntu

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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Validate xml files with xmlstarlet on Ubuntu

sudo apt install xmlstarletxmlstarlet val XML_FILE.xml

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Best way to exclude a folder from your search using the “find” command

I found it to be the fastest and most effective way to use the find command and exclude specific folders. That is using the “prune” option: find /FOLDER_TO_SEARCH_INSIDE -path /FOLDER_TO_EXCLUDE -prune -o -name ‘NAME_OR_PATTERN_TO_SEARCH_FOR’ -print That’s it, Enjoy! Source: https://stackoverflow.com/questions/4210042/how-to-exclude-a-directory-in-find-command

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How to beautify XML text on command line in Ubuntu

sudo apt install libxml2-utils echo ‘your xml stuff here’ | xmllint –format – You will get a beautiful well-organized XML output. Sources: https://jahansyed.co.uk/2016/04/22/how-to-install-xmllint-in-ubuntu/ https://stackoverflow.com/questions/16090869/how-to-pretty-print-xml-from-the-command-line

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Cleanup Docker Trash

Over time, docker images and residual unneeded files pile up and take a lot of space. We need to cleanup the following: stopped containers networks not used by at least one container dangling images build cache To do that, just … Continue reading

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Flush the DNS cache on Ubuntu 18.04

sudo systemd-resolve –flush-caches Source: https://askubuntu.com/questions/906476/how-can-i-flush-the-dns-on-ubuntu-17-04

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