Popular recipes tagged "linux" but not "shell"

Unix tee-like functionality via a Python class (Python)

2017-03-31T14:30:30-07:00

Python recipe 580767 by Vasudev Ram (cli, command, commandline, linux, python, tee, unix, utilities, windows).

The Unix tee commmand, when used in a command pipeline, allows you to capture the output of the preceding command to a file or files, while still sending it on to standard output (stdout) for further processing via other commands in a pipeline, or to print it, etc.

This recipe shows how to implement simple tee-like functionality via a Python class. I do not aim to exactly replicate the functionality of the Unix tee, only something similar.

More details and sample output here:

https://jugad2.blogspot.in/2017/03/a-python-class-like-unix-tee-command.html

A white noise generator to sooth baby to sleep. (Bash)

2017-05-13T12:12:30-07:00

Bash recipe 580801 by Barry Walker (alarm, apple, audio, baby_alarm, cygwin, linux, noise, sleep, sound, whitenoise).

This is a simple BASH, DASH and SH script to sooth a newborn baby to sleep for a laptop with a builtin mic. Develeoped around an Apple MacBook Pro.

Usage:- [./]shush.sh <time in seconds from 18 to 2700> [sensitivity [Hh|Mm|Ll]]<CR>

If time is omitted it defaults to 2 bursts of 9 seconds each and if sensitivity is omitted defaults to [M]edium.

It uses Quicktime Player for Apple OSX 10.12.4 minimum /dev/dsp for CygWin and some Linux flavours and arecored for Linux ALSA machines for baby awake detector.

Upon the two arguments the white noise generator runs for approximately the time given in $1 in bursts of 9 seconds until the time limit is reached. $2 is used to detect of baby is awake and reruns the noise generator again with a new noise waveform.

Enjoy...

A pseudo-echo, (or printf), function for any Python version. (Python)

2017-01-20T22:17:23-08:00

Python recipe 580750 by Barry Walker (amiga, apple, demo, echo, fs_uae, linux, printf, unix, windows, winuae).

A simple example of having a pseudo-echo using sys.stdout.write...

This gives exactly the same results from Python Versions, 1.4.0, 2.0.1, 2.5.6, 2.6.9, 3.4.3 and 3.5.2 on various platforms including the classic AMIGA A1200.

Enjoy finding simple solutions to often very difficult problems...

Bazza.

A simple raw hexdumper. (Python)

2016-09-19T13:24:37-07:00

Python recipe 580697 by Barry Walker (amiga, apple, fs_uae, hex, hexdump, linux, macbook_pro, raw_hexdump, unix, windows, winuae).

This is not a hexreader. This code creates a raw hexdump of a binary file that is whitespace, optional, delimited. The dump is saved into the current directory with a ".hex" extension.

It works on just about any current platform but is designed around a stock Amiga A1200(HD) with Python 1.4.0. It also works on the current stable version 3.5.2.

I needed a hexdump some years ago for banging the Amiga hardware, and decided to modify recently for another usage but it had to still work on version 1.4.0 for the classic A1200.

Enjoy...

A binary file split utility in Python (Python)

2016-04-07T18:19:35-07:00

Python recipe 580637 by Vasudev Ram (binary, commandline, linux, python, unix, utility, windows).

This recipe shows how to create a simple binary file split utility in Python.

It takes two command line arguments: 1) the name of the input file to split , 2) the number of bytes per file into which to split the input.

Simple command-line alarm clock in Python (Python)

2015-10-25T18:27:27-07:00

Python recipe 579117 by Vasudev Ram (alarm, clock, commandline, linux, python, time, unix, windows).

This recipe shows how to create a simple alarm clock in Python, that can be run from the command line in a terminal. It lets you specify the alarm time in minutes as a command line argument, and prints a wake-up message and beeps a few times, after that time arrives. You can use 0 for the minutes to test it immediately, including to adjust the volume using your speaker controls.

File comparison utility in Python (Python)

2016-03-26T18:31:11-07:00

Python recipe 580631 by Vasudev Ram (commandline, comparison, file, files, linux, python, unix, utilities).

This is a recipe to compare any two files via a Python command-line program. It is like a basic version of the cmp command of Unix or the fc.exe (file compare) command of Windows.

Python-controlled Unix pipeline to generate PDF (Python)

2016-01-07T18:02:52-08:00

Python recipe 579146 by Vasudev Ram (linux, pdf, pdf_generation, pipe, pipelining, python, python2, unix).

This recipe shows how to create a Unix pipeline that generates PDF output, under the control of a Python program. It is tested on Linux. It uses nl, a standard Linux command that adds line numbers to its input, and selpg, a custom Linux command-line utility, that selects only specified pages from its input, together in a pipeline (nl | selpg). The Python program sets up and starts that pipeline running, and then reads input from it and generates PDF output.

data_dump.py, like the Unix od (octal dump) command (Python)

2015-11-01T12:43:38-08:00

Python recipe 579120 by Vasudev Ram (data, dump, hexadecimal, linux, octal, od, representation, unix, utility, windows).

This recipe implements a simple data dump tool, roughly like the od command of Unix, which stands for octal dump (though od can also dump data in hex and other formats). This tool dumps data in character and hex formats, in this version. This is data_dump.py version 1.

A Function To Create A 1 Second Sinewave WAVE Beep File. (Python)

2014-11-23T19:24:46-08:00

Python recipe 578971 by Barry Walker (amiga, apple, audio, beep, error_beep, error_sound, e_uae, linux, sinewave, sound, wav, wave, windows, winuae).

sinebeep.py

Creating an audio file called...

beep.wav

...that can be played using almost ANY audio player available.

This simple snippet of code generates a 1 second sinewave WAVE file. It IS saved inside the CURRENT drawer so that you can find it... ;o)

This works on:- Classic stock AMIGA A1200, using Python 1.4.0. WinUAE and E-UAE, AmigaOS 3.0.x using Python 1.4.0 to 2.0.1. Windows, to at least 7, using Python 2.0.1 to 3.3.2. Various Linux flavours using Python 2.4.6 to 3.2.2. Apple OSX 10.7.x and above using Python 2.5.6 to 3.4.1.

The file size is 8044 bytes and _IF_ you need to it can be palyed directly without a player on some Linux flavours that have the /dev/dsp device. It is an 8 bit, unsigned integer, mono, 8000Hz sampling speed 8000 byte RAW file with the WAVE header added.

It will still work with PulseAudio and OSS using...

cat /full/path/to/beep.wav > /dev/dsp

...but with a momenatry click due to the 44 header bytes; but hey it is a beep alternative...

Enjoy finding simple solutions to often very difficult problems.

Bazza.

Daemon to create a wifi hotspot on linux (Python)

2014-07-08T04:45:27-07:00

Python recipe 578904 by Prahlad Yeri (hotspot, linux, wifi).

This recipe is based on Hotspotd, a small linux daemon to create a wifi hotspot on linux. It depends on hostapd for AP provisioning and dnsmasq to assign IP addresses to devices.

Hotspotd works by creating a virtual NAT (Network address transation) table between your connected device and the internet using iptables.

Simple Bash Text Mode Sine Curve Generator. (Bash)

2014-08-12T20:57:39-07:00

Bash recipe 578921 by Barry Walker (apple, bash, cygwin, graph, linux, macbook_pro, text). Revision 2.

This bash script is a taster for a kids level, audio, text mode, sweep generator. The code just creates a single cycle of a quantised sine curve inside an 80 x 24 bash terminal. This will be the calculator for a sinewave sweep generator from about 50Hz the 12KHz... The code tells you more and the display is in comments at the end...

A Bash Beep Command For OSX 10.7+... (Bash)

2014-02-27T19:36:17-08:00

Bash recipe 578837 by Barry Walker (apple, audio, bash, beep, error_beep, error_sound, linux, macbook_pro, sound).

This small bash script generates an 8044 byte 1KHz sinewave wave file and immediately plays it. The file created is a _pure_ sinewave and lasts for 1 second. It uses the default "afplay" command to run the generated file.

It was designed around an Apple Macbook Pro but using "aplay" it might even work on other *nix flavours from the command line. I have not bothered to try it as this was purely for my MB Pro.

The wave file can be found as "/tmp/sinewave.wav" during the working session(s) and can be saved anywhere of your choice.

Enjoy...

(Watch for word wrapping etc...)

Bazza.

Simple Text Mode Digital Oscilloscope Graphics DEMO. (Python)

2014-01-21T19:07:49-08:00

Python recipe 578812 by Barry Walker (apple, demo, graphics, linux, macbook_pro).

This is a DEMO to switch a *NIX terminal from text to _graphics_ mode on the fly.

The graphics characters are limited to lowercase 'a' through 'z' and this DEMO just prints a small subset to see what a fun, kids level, 8 channel Logic-Analyser/Digital-Oscilloscope might look like.

This may not work in every *NIX style terminal but does work on default terminals using bash on OSX 10.7.5, PCLinuxOS 2009 and Debian Linux 6.0.x.

Tested on Python 2.5.x to 3.3.2 on the above platforms... (It might work on earlier versions of Python but untested.)

Enjoy finding simple solutions to often very difficult problems...

Bazza...

JavaScript WebSocket client for Python + Go WebSocket-based system monitoring example (JavaScript)

2014-01-03T21:09:54-08:00

JavaScript recipe 578806 by Vasudev Ram (golang, javascript, linux, python, sysadmin, unix, websockets, windows).

This recipe is the JavaScript client side of an overall recipe that shows how to do system monitoring using WebSockets, Python, Go (using websocketd), and JavaScript + HTML. The server side of the recipe (in Python, and using websocketd which is written in Go), is here:

http://code.activestate.com/recipes/578803-using-websocketd-with-python-for-web-based-system-/?in=user-4173351

The system monitoring example shows the system disk space info (total, used and free) using the Python psutil module.

Create PDF at the end of a Unix pipeline with PDFWriter (Python)

2013-12-22T22:19:00-08:00

Python recipe 578794 by Vasudev Ram (commandline, linux, pdf, pipelining, reportlab, unix, xtopdf).

This recipe shows how to create PDF output at the end of a Unix or Linux pipeline, after all the text processing required, is done by previous components of the pipeline (which can use any of the standard tools of Unix such as sed, grep, awk, etc., as well as custom programs that act as filters).

A DEMO to show how to write text into the Python terminal Title Bar... (Python)

2013-09-17T17:55:53-07:00

Python recipe 578662 by Barry Walker (apple, bar, cygwin, demo, linux, macbook_pro, title, title_bar).

This DEMO is show how to write some text of your choice into the Title Bar of the Python terminal window.

Firstly it imports "time" just for this demo so that a simple time delay can be generated. Next the Python terminal window is written to for the 5 seconds of delay; see code. And finally the Title Bar is restored to normal...

A snapshot image can be seen here:-

http://wisecracker.host22.com/public/Title_Bar.jpg

Bazza...

Pseudo-3D effect in text mode... (Bash)

2013-09-10T21:23:58-07:00

Bash recipe 578655 by Barry Walker (3d, apple, bash, color, colour, display, linux, macbook_pro, text).

This is just a simple DEMO to display a pseudo-3D effect using a bash script. It generates a recessed box and a button and writes some thext inside bot.

There are two pieces of code, one for Linux, and one for OSX 10.7.5...

The Linux version also works on OSX 10.7.5 but is harder to see so a near identical version using the default OSX terminal colours was craeted instead.

You will have to split the two code pieces up yourself to run...

Enjoy finding simple solutions to often very difficult problems...

Bazza...

A Simple Clock, Well Maybe Not That Simple... (Python)

2013-08-09T18:15:09-07:00

Python recipe 578633 by Barry Walker (amiga, apple, big, clock, digits, e_uae, linux, macbook_pro, time, winuae).

BIG_TIME.py

Remember this?

http://code.activestate.com/recipes/578610-a-simple-clock-well-maybe-not-that-simple/

And this?

http://code.activestate.com/recipes/578079-pure-fun-for-text-mode-python/?in=user-4177147

Well the Python version of the top URL has been uploaded to AMINET on 01-08-2013...

Now the big gun that complained about my fun Python upload and voted it down can see that this was a serious attempt ae viewing "Hello World!" in extra large xharacters.

This is the result in Python...

It is ONLY uploaded to AMINET and that is where it will stay.

If you want it then use the pointer inside code section.

Remember to change the BIG_TIME.py.txt file on AMINET to BIG_TIME.py...

Designed around a Macbook Pro OSX 10.7.5 for the Classic AMIGA platforms and works on Debian 6.0.x and PCLiuxOS 2009 using Python versions 1.4.0 to 3.3.2 inclusive...

Although the description in the AMINET readme below is for an AMIGA environment it does not take a genius to adapt it to the other platforms...

Boy was this difficult to get working in a single Python script...

ENJOY...

This is the AMINET readme file:-

Short: A Big Digital Clock Python Script. Author: wisecracker@tesco.net (Barry Walker) Uploader: wisecracker@tesco.net (Barry Walker) Type: dev/src Version: 1.00.00 Architecture: generic; m68k-amigaos

Distribution: Public Domain, Emailware.

============================================================================

Architectures: Classic AMIGAs, E-UAE and WinUAE.

MINIMUM Requirements Are:-

    68EC020 CPU and 2MB RAM total, example, a standard A1200(HD).
    WinUAE Version 1.5.3 minimum. 
    Standard OS3.0x install or better.
    Python Version 1.4.0 or higher.
    (Also, OSX 10.7.5, Debian Linux 6.0.x and PCLinuxOS 2009.)

History.

01-08-2013. Version 1.00.00:- Original upload to AMINET...

This is dedicated entirely to the AMIGA community and AMINET and will not be uploaded elsewhere.

To install just download the "BIG_TIME.py.txt" file and rename it to "BIG_TIME.py" without the quotes. Drag this file into your AMIGA PYTHON: volume and...

From a minimum of Python Version 1.4.0 prompt:-

>>> exec(open("PYTHON:BIG_TIME.py").read())<CR>

And away you go...

This code is/was designed to work in all versions of Python from 1.4.0 to 3.3.2 on at least the platforms shown in the Architectures: section.

It was developed entirely on a Macbook Pro OSX 10.7.5 and finalised using MEmacs for the AMIGA.

This is just a simple DEMO to show how to generate large digits in Python and put them to use as an _AT_A_GLANCE_ digital clock.

It starts up by generating all of the characters available for the DEMO for five seconds then goes into the clock proper.

As this code is multi platform AND multi Python version then it is issued as GPL2...

Enjoy finding simple solutions to often very difficult problems...

                            IMPORTANT:-
                            -----------

The Legal Stuff:-
-----------------

This Python script is issued under the GPL2 licence conditions.
The author is not responsible for any damage to, or loss of, or
failure of equipment or data caused in any way by the use of this
script. There is NO warranty with the use of this software release
and YOU USE IT AT YOUR OWN RISK.

Testing Evaluation:-
--------------------

All WinUAE, E-UAE and Classic AMIGA test conditions were/are running
standard OS3.0x/OS3.1x and using standard ~topaz 8~ fonts throughout.

I have no idea what strange configuration setups will create so refer
to the ~The Legal Stuff~ above.

Contact:-

Mr Barry Walker, G0LCU.

Email:- wisecracker@tesco.net

Author of the ~TestGear?~ projects in the ~docs/hard~ drawer of AMINET.

A very useful HardWare related site, (C) Anthony Hoffman, for modifications, schematics, repairs and the like is:-

                      http://amiga.serveftp.net/

============================================================================

A FUN Bash Shell Bomb-Out Error Sound... (Bash)

2013-07-14T19:31:13-07:00

Bash recipe 578605 by Barry Walker (apple, audio, bash, error_beep, error_sound, linux, macbook_pro, sound, sound_exchange, sox).

Do you remember the Bomb-Out icon(s) that appeared on some computers' SW and HW many years ago...

Well this is a matching sound to go with it and can be used as a critical error sound.

It sounds like a bomb being dropped from an aeroplane and is purely a shell sript only.

It is set up to run SOund eXchange, SOX, but just by editing the code "/dev/dsp" can be used instead.

Read the code for more informastion.

Enjoy...

Bazza...