Language Selection

English French German Italian Portuguese Spanish

The Bash Fingertips: Making Your Own 'Information Centre'

Filed under
Howtos

Information Centre

FORGET bloated Web browsers. Forget so-called 'social' media (I call it social control media). They're not efficient, they eat up a lot of memory and CPU cycles, and the interfaces are not consistent (across sites). They're sufficiently distracting and they have ads. They erode privacy. They don't scale well; neither for an aging system (my laptop turns 10 in a few months) nor for users. GUIs are good in particular scenarios, but when the same things are repeated over and over again one might as well set up scripts, automating things and tailoring one's own interfaces, which is easy to achieve (relatively fast and simple) in the command line. It's also more accessible, e.g. over SSH. The pertinent tools are already out there (available for download/installation from repositories), they just need to be put together and programming skills aren't required, just batching in a bash file.

Some years ago I 'developed' a little script (I've been scripting since I was about 12). I called it getswap-sorted.sh and it just ran another script that helped me see what applications use the swap (and how much of it). For the sake of speed I like to restart applications that heavily use swap (i.e. depend on magnetic disk operations). I don't have much RAM. I never had more than 2 GB. getswap-sorted.sh just called out ./getswap.sh | sort -n -k 5 and getswap.sh comes from Erik Ljungstrom. Here it is:

#!/bin/bash
# Get current swap usage for all running processes
# Erik Ljungstrom 27/05/2011
SUM=0
OVERALL=0
for DIR in `find /proc/ -maxdepth 1 -type d | egrep "^/proc/[0-9]"` ; do
PID=`echo $DIR | cut -d / -f 3`
PROGNAME=`ps -p $PID -o comm --no-headers`
for SWAP in `grep Swap $DIR/smaps 2>/dev/null| awk '{ print $2 }'`
do
let SUM=$SUM+$SWAP
done
echo "PID=$PID - Swap used: $SUM - ($PROGNAME )"
let OVERALL=$OVERALL+$SUM
SUM=0

done

The output of getswap-sorted.sh would be something like this:


PID=1559 - Swap used: 16472 - (x-terminal-emul )
PID=21980 - Swap used: 16648 - (kwalletd5 )
PID=25548 - Swap used: 16704 - (konversation )
PID=631 - Swap used: 19336 - (kded5 )
PID=23817 - Swap used: 50048 - (pidgin )
PID=23923 - Swap used: 180312 - (thunderbird )


This helps me see which application/process number uses swap and to what degree. It's sorted by the amount of swap taken and the PID helps when I just want to kill a process from the command line (some are small and obsolete anyway).

My script, however, grew bigger over time. I added more things to it, eventually binding it to a special (fifth) mouse key, using xbindkeys -- an immensely valuable and powerful program I've used since around 2004. Extra mouse buttons always seemed worthless (anything more than three), but that's just because there was no program I needed to open or action I needed to invoke often enough. Over time I found that keeping a new terminal one click away (fourth button) and another special terminal also a click away improved my workflow/productivity. I just needed to invest some time in tailoring it. I ended up opening, temporarily, a terminal window with important information displayed, such as weather, disk space (I'm always near the limits), swap usage (I have only 2GB of RAM), uptime, real-time football scores etc. Change of wallpapers was lumped in too, for good measure...

For football tables/scores use one of the following 1) livescore-cli 2) soccer-cli and 3) football-cli.

Sadly, the above CLI football scores' tools got 'stolen' by Microsoft and need to isolate themselves GitHub, in due cource/time. I use the first of the three as it suits my needs best and does not require an API key.

The output looks like this:

 ... Fetching information from www.livescore.com ... 
Displaying Table for Barclay's Premier League
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                                Barclay's Premier League TABLE
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 LP     Team Name               GP      W       D       L       GF      GA      GD      Pts
--------------------------------------------------------------------------------------------------
 1      Liverpool               24      19      4       1       55      14      41      61
 2      Tottenham Hotspur       25      19      0       6       51      24      27      57
 3      Manchester City         24      18      2       4       63      19      44      56
 4      Chelsea                 25      15      5       5       45      23      22      50
 5      Arsenal                 24      14      5       5       50      33      17      47
 6      Manchester United       24      13      6       5       48      35      13      45
 7      Wolverhampton Wanderers 25      11      5       9       33      32      1       38
 8      Watford                 25      9       7       9       33      34      -1      34
 9      Everton                 25      9       6       10      36      36      0       33
 10     AFC Bournemouth         25      10      3       12      37      44      -7      33
 11     Leicester City          24      9       5       10      30      30      0       32
 12     West Ham United         24      9       4       11      30      37      -7      31
 13     Brighton & Hove Albion  25      7       6       12      27      36      -9      27
 14     Crystal Palace          25      7       5       13      26      33      -7      26
 15     Newcastle United        25      6       6       13      21      33      -12     24
 16     Southampton             25      5       9       11      27      42      -15     24
 17     Burnley                 25      6       6       13      26      46      -20     24
 18     Cardiff City            25      6       4       15      22      46      -24     22
 19     Fulham                  25      4       5       16      25      55      -30     17
 20     Huddersfield Town       25      2       5       18      13      46      -33     11
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 LP = League Position   GP = Games Played       W = Wins        D = Draws       L = Lose 
 GF = Goals For         GA = Goal Against       GD = Goal Differences
--------------------------------------------------------------------------------------------------
 Champions League       Champions League qualification  Europa League
 Europa League qualification    Relegation
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Real-time scores (when matches are on):

 ... Fetching information from www.livescore.com ... 
Displaying Scores for Barclay's Premier League
----------------------------------------------------------------------------
                 Barclay's Premier League SCORES 
----------------------------------------------------------------------------
 January 29  FT     Arsenal                  2 - 1  Cardiff City           
 January 29  FT     Fulham                   4 - 2  Brighton & Hove Albion 
 January 29  FT     Huddersfield Town        0 - 1  Everton                
 January 29  FT     Wolverhampton Wanderers  3 - 0  West Ham United        
 January 29  FT     Manchester United        2 - 2  Burnley                
 January 29  FT     Newcastle United         2 - 1  Manchester City        
 January 30  FT     AFC Bournemouth          4 - 0  Chelsea                
 January 30  FT     Southampton              1 - 1  Crystal Palace         
 January 30  FT     Liverpool                1 - 1  Leicester City         
 January 30  FT     Tottenham Hotspur        2 - 1  Watford                
 February 2  FT     Tottenham Hotspur        1 - 0  Newcastle United       
 February 2  FT     Brighton & Hove Albion   0 - 0  Watford                
 February 2  FT     Burnley                  1 - 1  Southampton            
 February 2  FT     Chelsea                  5 - 0  Huddersfield Town      
 February 2  FT     Crystal Palace           2 - 0  Fulham                 
 February 2  FT     Everton                  1 - 3  Wolverhampton Wanderers
 February 2  FT     Cardiff City             2 - 0  AFC Bournemouth        
 February 3  15:05  Leicester City           ? - ?  Manchester United      
 February 3  17:30  Manchester City          ? - ?  Arsenal                
 February 4  21:00  West Ham United          ? - ?  Liverpool              
----------------------------------------------------------------------------
---------------------------------------

Now putting it all together:


feh --bg-fill --randomize /media/roy/c3fd5b6e-794f-4f24-b3e7-b4ead3722f11/home/roy/Main/Graphics/Wallpapers/Single\ Head/natgeo/* &

livescore -t bpl 

./getswap.sh | sort -n -k 5
 curl -4 http://wttr.in/Manchester
 swapon --summary | grep sda2
 df | grep sda1
uptime

sleep 10

livescore -s bpl 

sleep 40

The first line is feh choosing a wallpaper at random from a collection of award-winning National Geographic photographs. The options and the underlying parameters are self-explanatory.

The football league's table is then shown.

Next, after about 10 seconds of processing, a list of processes will show up based on swap usage (as described above)

The weather at home (Manchester) will then be shown, with colour. Right now I get:

Weather report: Manchester

     \   /     Sunny
      .-.      -5--2 °C       
   ― (   ) ―   ↑ 9 km/h       
      `-’      10 km          
     /   \     0.0 mm         
                                                       ┌─────────────┐                                                       
┌──────────────────────────────┬───────────────────────┤  Sun 03 Feb ├───────────────────────┬──────────────────────────────┐
│            Morning           │             Noon      └──────┬──────┘     Evening           │             Night            │
├──────────────────────────────┼──────────────────────────────┼──────────────────────────────┼──────────────────────────────┤
│    \  /       Partly cloudy  │      .-.      Light drizzle  │  _`/"".-.     Light rain sho…│               Mist           │
│  _ /"".-.     -4-0 °C        │     (   ).    -2-3 °C        │   ,\_(   ).   1-3 °C         │  _ - _ - _ -  0-3 °C         │
│    \_(   ).   ↑ 12-20 km/h   │    (___(__)   ↑ 17-26 km/h   │    /(___(__)  ↗ 7-14 km/h    │   _ - _ - _   ↑ 9-17 km/h    │
│    /(___(__)  20 km          │     ‘ ‘ ‘ ‘   20 km          │      ‘ ‘ ‘ ‘  16 km          │  _ - _ - _ -  13 km          │
│               0.0 mm | 0%    │    ‘ ‘ ‘ ‘    0.4 mm | 83%   │     ‘ ‘ ‘ ‘   0.4 mm | 65%   │               0.0 mm | 0%    │
└──────────────────────────────┴──────────────────────────────┴──────────────────────────────┴──────────────────────────────┘
                                                       ┌─────────────┐                                                       
┌──────────────────────────────┬───────────────────────┤  Mon 04 Feb ├───────────────────────┬──────────────────────────────┐
│            Morning           │             Noon      └──────┬──────┘     Evening           │             Night            │
├──────────────────────────────┼──────────────────────────────┼──────────────────────────────┼──────────────────────────────┤
│      .-.      Light drizzle  │  _`/"".-.     Patchy rain po…│               Cloudy         │               Cloudy         │
│     (   ).    2-6 °C         │   ,\_(   ).   3-7 °C         │      .--.     1-4 °C         │      .--.     -2 °C          │
│    (___(__)   → 16-26 km/h   │    /(___(__)  → 20-27 km/h   │   .-(    ).   → 13-23 km/h   │   .-(    ).   ↗ 9-16 km/h    │
│     ‘ ‘ ‘ ‘   14 km          │      ‘ ‘ ‘ ‘  18 km          │  (___.__)__)  20 km          │  (___.__)__)  20 km          │
│    ‘ ‘ ‘ ‘    0.3 mm | 88%   │     ‘ ‘ ‘ ‘   0.3 mm | 88%   │               0.0 mm | 0%    │               0.0 mm | 0%    │
└──────────────────────────────┴──────────────────────────────┴──────────────────────────────┴──────────────────────────────┘
                                                       ┌─────────────┐                                                       
┌──────────────────────────────┬───────────────────────┤  Tue 05 Feb ├───────────────────────┬──────────────────────────────┐
│            Morning           │             Noon      └──────┬──────┘     Evening           │             Night            │
├──────────────────────────────┼──────────────────────────────┼──────────────────────────────┼──────────────────────────────┤
│    \  /       Partly cloudy  │               Overcast       │               Overcast       │      .-.      Light drizzle  │
│  _ /"".-.     -1-3 °C        │      .--.     2-6 °C         │      .--.     6 °C           │     (   ).    1 °C           │
│    \_(   ).   ↖ 19-31 km/h   │   .-(    ).   ↑ 23-33 km/h   │   .-(    ).   ↑ 24-40 km/h   │    (___(__)   ↑ 24-40 km/h   │
│    /(___(__)  20 km          │  (___.__)__)  19 km          │  (___.__)__)  8 km           │     ‘ ‘ ‘ ‘   9 km           │
│               0.0 mm | 0%    │               0.0 mm | 0%    │               0.0 mm | 0%    │    ‘ ‘ ‘ ‘    0.3 mm | 0%    │
└──────────────────────────────┴──────────────────────────────┴──────────────────────────────┴──────────────────────────────┘


After this I am shown general memory usage and disk usage (for a particular partition) along with uptime thusly:

/dev/sda2                               partition       2097148 381128  -1
/dev/sda1        84035088   77299588   2443660  97% /
 08:03:28 up 116 days, 12:36,  7 users,  load average: 1.70, 1.40, 1.26

It will close on its own after I see what needs seeing, owing to the sleep command. It saves me the clicking (required to then close the window); it just fades away or 'expires', so to speak (until the next time the mouse button gets pressed).

More in Tux Machines

Mabox Linux 21.11 Herbolth released

After almost half year of development, the next major Mabox Linux 21.11 release codename Herbolth is ready for download. Read more

today's howtos

  • Hashing out the hash command on Linux | Network World

    When you type “hash” on a Linux system, you could get one of two very different responses depending on the shell you are using. If you are using bash or a related shell such as ksh, you should see a list of the commands that you have used since your terminal session began, sometimes with a count of how many times each command was used. This can be more useful than using the history command if you just want to see your very recent command activity, but the hash command is not a single executable. Instead, it relies on your shell.

  • Learn About Blender and Maybe Get a Free Book – What’s Not to Like?

    The event is Blender 101, an online event from the All Things Open folks, which will feature Jason van Gumster, author of Blender for Dummies, which is popular enough to now be in its fourth edition. Better yet, some copies of the book will be given away “to randomly chosen attendees.”

  • Why must you use ./ to run your Ubuntu scripts? The meaning of Linux's dot slash explained. - Coffee Talk: Java, News, Stories and Opinions

    When you run your own executable command or shell script on Linux, you must prepend ./ to the Unix command. But why? Why must you use a dot slash to run commands in Unix? You don’t have to do that in Windows with a batch file.

  • What Is Doas and How to Install It

    Doas is a privilege escalation program similar to sudo. It is designed to be as lightweight and simple as possible. It is the default privilege escalation program for OpenBSD but also available for other UNIX-like operating systems through the OpenDoas program.

  • Shell Aliases Every Linux User Needs - Invidious

    One of the most common questions I get from new-to-Linux users is, "How can I become a power user?" Well, learning the terminal and the terminal commands is the best thing you can do. And big part of becoming more proficient at the command line is creating your own Bash aliases. So today, I'm taking a fresh install of Ubuntu and adding aliases to it's bashrc. These are aliases that I think most, if not all, Ubuntu users would find helpful.

Season of KDE and Creating a Rust/QML Project

  • Season of KDE Kicks Off
  • Season of KDE 2022

    I am Ayush Singh, a second-year student of the Indian Institute of Technology, Dhanbad, India. My application has been accepted in the Season of KDE 2022. I will be working on writing a Rust wrapper for KConfig KDE Framework. This post describes my journey with KDE and why I submitted this Project for the Season of KDE.

  • Creating Rust/QML Project

    For the last few months, I have been pushing Rust/QT development along. I am the author of ki18n crate and am currently in the middle of creating kconfig crate as a part of Season of KDE 2022. In this post, I will walk you through creating a new Rust/QML project using cargo-generate templates. I made these templates to encourage more people to test out Qt development with Rust.

Security Leftovers

  • Security updates for Wednesday

    Security updates have been issued by CentOS (httpd), Debian (libxfont, lrzsz, nss, openjdk-17, policykit-1, webkit2gtk, and wpewebkit), Mageia (polkit), openSUSE (expat, json-c, kernel, polkit, qemu, rust1.55, rust1.57, thunderbird, unbound, and webkit2gtk3), Oracle (httpd:2.4, java-11-openjdk, and polkit), Red Hat (httpd:2.4, OpenShift Container Platform 3.11.570, polkit, and Red Hat OpenStack Platform 16.1 (etcd)), Scientific Linux (polkit), Slackware (polkit), SUSE (aide, expat, firefox, json-c, kernel, polkit, qemu, rust, rust1.55, rust1.57, thunderbird, unbound, and webkit2gtk3), and Ubuntu (policykit-1 and xorg-server).

  • Qualys Research Team Warns of Significant polkit Vulnerability Affecting All Linux Users [Ed: This headline is false. It affects systemd users. And systemd isn't Linux, it's IBM vendor lock-in which isn't even compliant with UNIX philosophy.]
  • New DeadBolt ransomware targets QNAP devices, asks 50 BTC for master key [Ed: Why would anyone even connect a storage device to the open Internet in the fist place? "Smart" hype?]

    A new DeadBolt ransomware group is encrypting QNAP NAS devices worldwide using what they claim is a zero-day vulnerability in the device's software.

  • New DeadBolt Ransomware Targets NAT Devices