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FreeBSD Notes
  • rickR

    Screen recording can use webm as their format, it can be more simple to use a gif to embed into a website or forum, than adding scripts to host different video format.

    In this case I grabbed a screen record of the progress for writing zeros to a hard drive with dd

    Use ffmpeg to convert webm to gif:

    First create a pallet:

    Move into the directory which the webm is located, or type in the path

    Where ‘dd.webm’ is the screen recording

    ffmpeg -y -i dd.webm -vf palettegen palette.png

    Output:

    dd-ffmpeg.png

    Then convert the webm to gif:

    ffmpeg -y -i dd.webm -i palette.png -filter_complex paletteuse -r 10 dd.gif

    dd-webm-2.png

    This is what I ended up with, looks like any image of any alien on the interwebz, as if shot through a potato, some tweaking of the command is in my future. None the less.

    dd.gif

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  • rickR

    Write zeros to all sectors

    Use the command ‘lsblk’ to find the drive you wish to erase

    I’m using ‘dd’ to erase things

    In this case I’m torching sdb

    Only use status=progress if you care it’s not necessary

    dd if=/dev/zero of=/dev/sdb bs=12M status=progress

    dd.gif

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  • rickR

    Remove old kernel images that are cluttering the system

    zstd-no-space-error.png

    Most of these errors are due to low or not enough space left in the root partition.

    If you are using a Debian flavor:

    sudo apt-get autoremove --purge

    zstd-error.png

    Inform grub whenever an old kernel is removed:

    update grub

    update-grub.png

    Remove the un-used kernel config files:

    These will be the files pre cursed as ‘rc’ where installed kernels use ‘ii’

    … As well as files no longer used or required due to dependencies

    This command will detect, print, and remove left over cruft from previously installed packages or scripts, that have been removed or updated.

    sudo dpkg --purge $(dpkg -l | awk '/^rc/{print $2}')

    purge.png

    You can re-run the following to view the installed kernel(s):

    dpkg --list | grep linux-image

    installed-kernels.png

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  • rickR

    To list all files in current directory including dot files (hidden files or directories), as well as print permissions :

    ls -la
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  • rickR
    Install Ruby on Debian

    Install rbenv

    sudo apt install rbenv

    Then initialize the environment:

    rbenv init

    rbenv-init.png

    nano ~/.bashrc

    Type or paste the output above, Ctrl +x to save

    Apply:

    source .bashrc

    Install ruby-build

    Install git:

    sudo apt install git

    install-git.png

    mkdir -p "$(rbenv root)"/plugins

    Clone to local:

    git clone https://github.com/rbenv/ruby-build.git "$(rbenv root)"/plugins/ruby-build

    clone-ruby.png

    curl -fsSL https://github.com/rbenv/rbenv-installer/raw/main/bin/rbenv-doctor | bash

    ruby-doctor.png

    Now install Ruby:

    print ruby versions available

    rbenv install --list

    rb-list.png

    Install the latest version unless you have a reason otherwise:

    rbenv install 3.3.0

    On this system there was an error compiling at this point with fiddle, as well as psych: ruby-failed.png

    Therefore manually installing the following filled dependencies

    sudo apt install libtool sudo apt install libffi-dev

    rb-compile.png

    rbenv global 3.3.0

    print installed ruby version

    ruby -v

    ruby-version-installed.png

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