Askew’s Stuff

Systemd Notes

2019-11-07T17:46:57-05:00

How long did the last startup take?

$ systemd-analyze 
Startup finished in 7.329s (firmware) + 5.115s (loader) + 1.682s (kernel) + 2.403s (userspace) = 16.530s 
graphical.target reached after 1.833s in userspace

List services enabled at startup:

$ systemctl list-unit-files | grep enabled

If you need to know which services take the longest to startup:

$ systemd-analyze blame
           565ms systemd-timesyncd.service
           564ms lvm2-monitor.service
           561ms tlp.service
           510ms dev-nvme0n1p2.device
           457ms upower.service
           391ms systemd-logind.service
           260ms systemd-udevd.service
           192ms systemd-journald.service
           192ms ldconfig.service
           165ms ModemManager.service
           108ms udisks2.service
           ...
           ...

If you want to disable/enable a service:

sudo systemctl disable SERVICE_NAME
sudo systemctl enable SERVICE_NAME

Color Man Pages in Terminal

2019-06-26T15:46:57-04:00

I found the following online somewhere while trying to get some color / better output when viewing man pages in the terminal.

export LESS_TERMCAP_mb=$'\E[1;31m'     # begin bold
export LESS_TERMCAP_md=$'\E[1;36m'     # begin blink
export LESS_TERMCAP_me=$'\E[0m'        # reset bold/blink
export LESS_TERMCAP_so=$'\E[01;44;33m' # begin reverse video
export LESS_TERMCAP_se=$'\E[0m'        # reset reverse video
export LESS_TERMCAP_us=$'\E[1;32m'     # begin underline
export LESS_TERMCAP_ue=$'\E[0m'        # reset underline
export GROFF_NO_SGR=1                  # for konsole and gnome-terminal

I’ve saved it to ~/.bash_termcap and added the following to ~/.bashrc :

if [ -f ~/.bash_termcap ]; then
        source ~/.bash_termcap
fi

Google Calendar Syncing

2019-06-18T19:46:57-04:00

I forget why I needed this, but I remember it helped me with some sort of mobile syncing issue. Saving it here for future me. Maybe he’ll remember.

https://calendar.google.com/calendar/syncselect

KMail and Akonadiserver CPU utilization

2019-06-18T18:46:57-04:00

KMail was chewing CPU and this seemed to help. May also be useful after kmail/akonadi upgrades.

$> akonadictl fsck
$> akonadictl vacuum
$> akonadictl fsck
$> akonadictl restart

Hope this helps.

Spotify, HiDPI and You

2018-12-14T10:00:57-05:00

If you have a xps9360 like I do, then your beautiful UHD screen is wonderful. What’s not wonderful is how some applications don’t place nice. If you have problems with Spotify being unreadble …. try this:

$> spotify --force-device-scale-factor=1.5

https://community.spotify.com/t5/Desktop-Linux-Windows-Web-Player/Linux-client-barely-usable-on-HiDPI-displays/td-p/1067272

Using a Superdrive in Linux

2018-12-13T23:46:57-05:00

You have to send a “magic packet” in order for the drive to work. Really Apple!!!???

$> ls /dev # list devices

# the drive should be listed as sr0 or sr1

# send the magic packet replace sr0 with your drive
$> sg_raw /dev/sr0 EA 00 00 00 00 00 01

# custom udev rule send magic packet when drive is plugged in
$> cat /etc/udev/rules.d/99-local.rules

ACTION=="add", ATTRS{idProduct}=="1500", ATTRS{idVendor}=="05ac", DRIVERS=="usb", RUN+="/usr/bin/sg_raw /dev/$kernel EA 00 00 00 00 00 01"

Linux Hardware Info

2018-11-15T23:00:00-05:00

=> inxi -Fxxxz

Show info about memory hardware:

$ sudo lshw -c memory     
  *-firmware                
       description: BIOS
       vendor: Dell Inc.
       physical id: 0
       version: 1.3.2
       date: 01/18/2017
       size: 64KiB
       capacity: 15MiB
       capabilities: pci pnp upgrade shadowing cdboot bootselect edd int13floppynec int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb smartbattery biosbootspecification netboot uefi
  *-memory
       description: System Memory
       physical id: 38
       slot: System board or motherboard
       size: 16GiB
     *-bank:0
          description: Row of chips LPDDR3 Synchronous Unbuffered (Unregistered) 1867 MHz (0.5 ns)
          product: MT52L1G32D4PG-107
          vendor: Micron
          physical id: 0
          serial: 00000000
          slot: System Board Memory
          size: 8GiB
          width: 64 bits
          clock: 1867MHz (0.5ns)
     *-bank:1
          description: Row of chips LPDDR3 Synchronous Unbuffered (Unregistered) 1867 MHz (0.5 ns)
          product: MT52L1G32D4PG-107
          vendor: Micron
          physical id: 1
          serial: 00000000
          slot: System Board Memory
          size: 8GiB
          width: 64 bits
          clock: 1867MHz (0.5ns)
  *-cache:0
       description: L1 cache
       physical id: 3c
       slot: L1 Cache
       size: 128KiB
       capacity: 128KiB
       capabilities: synchronous internal write-back unified
       configuration: level=1
  *-cache:1
       description: L2 cache
       physical id: 3d
       slot: L2 Cache
       size: 512KiB
       capacity: 512KiB
       capabilities: synchronous internal write-back unified
       configuration: level=2
  *-cache:2
       description: L3 cache
       physical id: 3e
       slot: L3 Cache
       size: 4MiB
       capacity: 4MiB
       capabilities: synchronous internal write-back unified
       configuration: level=3
  *-memory UNCLAIMED
       description: Memory controller
       product: Sunrise Point-LP PMC
       vendor: Intel Corporation
       physical id: 1f.2
       bus info: pci@0000:00:1f.2
       version: 21
       width: 32 bits
       clock: 33MHz (30.3ns)
       configuration: latency=0
       resources: memory:dc32c000-dc32ffff

Linux System Monitoring

2018-11-11T17:46:57-05:00

=> watch grep \"cpu MHz\" /proc/cpuinfo
=> dmesg -wx

Jekyll Notes

2018-10-17T18:46:57-04:00

=> bundle exec jekyll build #bundle required to genererate rss feeds correctly
=> jekyll serve
=> JEKYLL_ENV=production bundle exec jekyll clean
=> JEKYLL_ENV=production bundle exec jekyll build
=> s3_website push

Modifiying the default theme can be useful. If you want to know what the current theme is and where the gem is located:

THEME=`cat _config.yml | grep theme`; bundle show `echo ${THEME##*:}`

~/.aws/credentials file required

https://github.com/dhaskew/blog

I use the S3 Website tool to automate the uploading of the site to s3.

Check out the Jekyll docs for more info on how to get the most out of Jekyll. File all bugs/feature requests at Jekyll’s GitHub repo. If you have questions, you can ask them on Jekyll Talk.

Welcome to Jekyll!

2018-10-17T18:46:57-04:00

You’ll find this post in your _posts directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in many different ways, but the most common way is to run jekyll serve, which launches a web server and auto-regenerates your site when a file is updated.

To add new posts, simply add a file in the _posts directory that follows the convention YYYY-MM-DD-name-of-post.ext and includes the necessary front matter. Take a look at the source for this post to get an idea about how it works.

Jekyll also offers powerful support for code snippets:

def print_hi(name)
  puts "Hi, #{name}"
end
print_hi('Tom')
#=> prints 'Hi, Tom' to STDOUT.

Check out the Jekyll docs for more info on how to get the most out of Jekyll. File all bugs/feature requests at Jekyll’s GitHub repo. If you have questions, you can ask them on Jekyll Talk.