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Howtos

Using Menus For Command Line Programs and Scripts

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Howtos

THE holidays are coming (Christmas approaching), so I've taken advantage of some spare time to menu-ise commands that I use frequently. Those commands aren't the mere opening of an application and they often require dealing with input and output (in the command line). So I've created menu.sh and used dialog to craft the following menu, e.g. for operations associated with Techrights. I invoke this menu with the click of one button (of the mouse).

Rianne has a similar menu for commands she often runs (which are long and would otherwise need pasting or typing in length). Her menu looks something like this:

Rianne's menu

Here's the code (bash file) that renders the menu above (it's really that simple!):


#!/bin/bash

HEIGHT=15
WIDTH=40
CHOICE_HEIGHT=4
BACKTITLE="Aloha, Rianne"
TITLE="Rianne @ Ted"
MENU="Choose one of the following options:"

OPTIONS=(1 "Start VPN"
         2 "REDACTED"
         3 "REDACTED"
	4 "REDACTED"
	5 "REDACTED"
	6 "REDACTED"
	7 "REDACTED"
)

CHOICE=$(dialog --clear \
                --backtitle "$BACKTITLE" \
                --title "$TITLE" \
                --menu "$MENU" \
                $HEIGHT $WIDTH $CHOICE_HEIGHT \
                "${OPTIONS[@]}" \
                2>&1 >/dev/tty)

clear
case $CHOICE in
        1)
            echo "You chose Option 1"
sh ~/vpn.sh ;;

        2)
            echo "You chose Option 2"
REDACTED COMMAND ;;
        3)
            echo "You chose Option 3"
REDACTED COMMAND ;;
        4)
            echo "You chose Option 4"
REDACTED COMMAND ;;
        5)
            echo "You chose Option 5"
REDACTED COMMAND ;;
        6)
            echo "You chose Option 6"
REDACTED COMMAND ;;
        7)
            echo "You chose Option 7"
REDACTED COMMAND ;;

esac

Hopefully this inspires other people out there to do the same. It takes a while to set up, but it's a big time saver over the long run.

The Bash Fingertips: Making Your Own 'Information Centre'

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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).

How to rename files in bulk

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Howtos

Consider this common scenario. A directory contains multiple files that are named using a common convention: for example, image-001.png, image-002.png, image-003.png, etc. You want to rename the files to, say, upload-001.png, upload-002.png, upload-003.png, etc.

The coders among us can write a bash script to automate the process. For expedience, this post shows how to use the built-in rename command to achieve the same goal.

Fixing OpenSuse’s Dog Awful default fonts…

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Lets not beat around the bush here, the default font rendering in OpenSuse and the default font do not an OS fit for reading make.. this can be fixed however..

Love or hate Ubuntu, out of the box it has one of the best font rendering setups of any distro and considering how much time we spend on our PC’s setting your fonts up correctly is one less headach, literally.

I’m not sure how much of these instructions I got right, however after a reboot the screen text does at least look better..

Read More

Stopping Screen Flickering on Ivy Bridge Laptops using Linux

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This is a solution to a problem which has been dogging me on every version of Linux I install on the Acer Aspire S3. I'm hoping it will help someone.

Read my solution

Forgot your Ubuntu Password? All is not lost.

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It’s always a pain when you forget your password, and i’ve often done it on an Ubuntu install. All however is not lost as a stock Ubuntu install its quite easy to reset your password

Read More

Creating an AD Server for Free using Ubuntu and Samba

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Howtos

While being a huge fan of the GNU/Linux OS I do also live in the real world which means using Active Directory Domain Controllers and Windows networks. this week however I’ve had to build for a project a stand alone AD network. This got me thinking to a project I built for a school 6 uears ago which I did the same thing with Samba on Fedora.

Remote Application launching using X11 and SSH.. Oldie but a goodie..

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Using WordPress as my central blog platform I’m very happy with it, not much to complain about, some good features, it’s very social and some nice themes. However it’s got me thinking not so much my content i’m now having a “problem” to manage it’s dealing with the replies

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Using the right tools to get your media..

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When it comes to getting what you want off the interent, its pretty fair to say, that there is an application and a set of instructions to do this. In this day and age its fair to say that getting media off the web should be the way that media companies distribute. Instead of trying to reinvent the wheel. Unfortunately they don't they bog you down with Websites, DRM, Magma and lots more.. Well This is how to get your media another way..

Standard Disclaimer: Your use of this software and configuration is at your own risk. Check the legality of downloading TV shows in your area. This post is purely for the sake of information.

.

Read more...

Big Bear's Helpful Hints-Google Docs Spreadsheets

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I like to jot down things that I learn how to do on the spur of the moment so that I can find it later.

I admit, in the 80's there was quite of bit of "herbal remedy" usage and my short term memory isn't what it could be. That's my story and I'm sticking to it.

I've decided that I might as well potentially help some other folks who might want to know about some of the things I discover, so I thought why not here?

For my very first post, I wanted to figure out how to sum cells across multiple pages in Google Docs spreadsheets.

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More in Tux Machines

Kernel and Graphics: Linux Stuff and GPUs

  • Facebook/Meta Tackling Transparent Page Placement For Tiered-Memory Linux Systems - Phoronix

    Back during the Linux 5.15 cycle Intel contributed an improvement for tiered memory systems where less used memory pages could be demoted to slower tiers of memory storage. But once demoted that kernel infrastructure didn't have a means of promoting those demoted pages back to the faster memory tiers should they become hot again, though now Facebook/Meta engineers have been working on such functionality.  Prior to the Linux 5.15 kernel, during the memory reclaim process when the system RAM was under memory pressure was to simply toss out cold pages. However, with Linux 5.15 came the ability to shift those cold pages to any slower memory tiers. In particular, modern and forthcoming servers with Optane DC persistent memory or CXL-enabled memory, etc. Therefore the pages are still accessible if needed but not occupying precious system DRAM if they aren't being used and to avoid just flushing them out or swapping to disk. 

  • Linux 5.17 To Boast Latency Optimization For AF_UNIX Sockets - Phoronix

    Net-next has been queuing a number of enticing performance optimizations ahead of the Linux 5.17 merge window kicking off around the start of the new year. Covered already was a big TCP optimization and a big improvement for csum_partial() that is used in the network code for checksum computation. The latest optimization is improving the AF_UNIX code path for those using AF_UNIX sockets for local inter-process communication.  A new patch series was queued up on Friday in net-next for improving the AF_UNIX code. That patch series by Kuniyuki Iwashima of Amazon Japan is ultimately about replacing AF_UNIX sockets' single big lock with per-hash locks. The series replaces the AF_UNIX big lock and also as part of the series has a speed-up to the autobind behavior. 

  • Nvidia Pascal GPU, DX12 and VKD3D: Slideshow time! - Boiling Steam

    So Horizon Zero Dawn had a sale recently on Fanatical, and I thought… OK I’ll grab it! It’s time. I first installed it on my workstation that only has a GTX1060 3GB GPU – not a workhorse but a decent card nonetheless for low-to-medium end gaming. I knew very well that Horizon Zero Dawn is a DX12 game and that Pascal architecture (Nvidia 10xx basically) and earlier versions do not play very well with DX12 games running through vkd3d-proton, the DX12 to Vulkan translation layer. Still, I could imagine getting somewhere around 30 FPS on low-to-medium settings, and use FSR if necessary to get to better framerates. Nothing prepared me for the performance I was about to experience.

Linux 5.16-rc3

So rc3 is usually a bit larger than rc2 just because people had some
time to start finding things.

So too this time, although it's not like this is a particularly big
rc3. Possibly partly due to the past week having been Thanksgiving
week here in the US. But the size is well within the normal range, so
if that's a factor, it's not been a big one.

The diff for rc3 is mostly drivers, although part of that is just
because of the removal of a left-over MIPS Netlogic driver which makes
the stats look a bit wonky, and is over a third of the whole diff just
in itself.

If you ignore that part, the statistics look a bit more normal, but
drivers still dominate (network drivers, sound and gpu are the big
ones, but there is noise all over). Other than that there's once again
a fair amount of selftest (mostly networking), along with core
networking, some arch updates - the bulk of it from a single arm64
uaccess patch, although that's mostly because it's all pretty small -
and random other changes.

Full shortlog below.

Please test,

             Linus
Read more Also: Linux 5.16-rc3 Released With Alder Lake ITMT Fix, Other Driver Fixes - Phoronix

Audiocasts/Shows: Endless OS 4.0.0, GIMP, BSD, KDE, and Elementary

today's howtos

  1. How to install FreeOffice 2021 on Ubuntu 20.04 Linux

    One of the best free alternatives to Microsoft Office is FreeOffice, developed by a German software company- SoftMaker. Recently, they have upgraded their Office suite to version 21. And here we learn the steps to install FreeOffice 2021 version on Ubuntu 20.04 Linux using the command terminal. This free office suite is a part of the commercial one from the same developers known as SoftMaker Office 21 (also available for Linux), of course, the premium will have more features but that doesn’t mean the free version- FreeOffice 2021 deprives to full fill all daily office documents (MS-Word alternative) related requirements. It offers a Microsoft office ribbon-like interface and three modules- TextMaker 21 to create documents; PlanMaker 21 to create sheets (Excel alternative) and Presentations 21 for making slides like MS-Powerpoint.

  2. Pin Custom Folders to Left Panel ‘Files’ Icon Context Menu in Ubuntu 20.04 | UbuntuHandbook

    In Windows 10, user may right-click on the ‘File Explorer’ icon on panel to access pinned folders (e.g., Desktop, Downloads and Documents) quickly. Ubuntu has first implemented this feature in Ubuntu 21.10, though it seems to be not working properly due to bug. Ubuntu 20.04 may manually add the context (right-click) menu options so user can right-click on the ‘Files’ icon to choose open favorite folders quickly.

  3. How To Install Perl on AlmaLinux 8 - idroot

    In this tutorial, we will show you how to install Perl on AlmaLinux 8. For those of you who didn’t know, Perl (Practical Extraction and Reporting Language) is a general-purpose programming language originally developed for text manipulation and now used for a wide range of tasks including system administration, web development, network programming, GUI development, and more. The major features of Perl are easy to use, supports object-oriented and procedural programming languages, and has built-in support for processing text. The most impressive feature of Perl is that it supports a large collection of third-party modules. This article assumes you have at least basic knowledge of Linux, know how to use the shell, and most importantly, you host your site on your own VPS. The installation is quite simple and assumes you are running in the root account, if not you may need to add ‘sudo‘ to the commands to get root privileges. I will show you the step-by-step installation of the Perl programming language on AlmaLinux 8. You can follow the same instructions for Rocky Linux.

  4. How to play Total War: WARHAMMER on Linux

    Total War: Warhammer is a turn-based real-time tactics video game developed by Creative Assembly and published by Sega. It takes place in the War Hammer 40K universe. Here’s how you can play it on your Linux PC.

  5. How to install Funkin' Vs. Camellia on a Chromebook

    Today we are looking at how to install Funkin' Vs. Camellia on a Chromebook. Please follow the video/audio guide as a tutorial where we explain the process step by step and use the commands below.