PrtScr or Printscreen not working [Resolved]

Think your print screen not working, or you keep on hitting and nothing come up, no worries here is that thing to have in mind.

Windows 10 had made that different.

* Ctrl + PrtScr <- will just add the screen image to clipboard, means you manually need to paste somewhere in word or paint you choose it.

* Win + PrtScr key <- this save the screenshots in "pictures/screenshot" folder.


Hope saved your time.....  😉

How to know your Mobile number

*282# - airtel (verified) 
*888# - BSNL (verified) 
Call 1299 - Jio, will SMS with details (verified) 
*111*2# (not verified) 

Enable Developer Options on Xiaomi & Redmi Phones

• Go to Settings >> About Phone >> MIUI version.
• Tap on “MIUI version” for 7 times until developer mode appears. You’ll see the “You are now a developer” message appears on the screen.

Now go to Settings >> Additional Settings >> Developer Options, touch the toggle to enable Developer Option

Perl to download mp3 from the html page using wget

The script I have tried to get the mp3 files from the web.

#!/usr/bin/perl

die "Usage: $0 <url of page> \n" if @ARGV < 1;

sub getLineFromFile
{
my @outArray;
my $in = shift;
open (my $inf,"<",$in) or die "can't reader the $in";
while(my $row = <$inf>)
{
chomp $row;
#print $row."\n";
push (@outArray,$row);
} 
return @outArray;
}

my $url = shift;
`wget $url`;

$url =~ /([^\/]+\.html)/; #Regex to look for last / and token next with .html 
my$filename = $1;

my @lines = getLineFromFile($filename);

foreach my $line (@lines)
{
my $command;
$line =~/<a .*href="(.*download.*\.mp3)">/; #modify if you find any different href url
my $mp3url = $1;
if($mp3url =~ /\.mp3$/){
#print "get me ".$mp3url."\n";
`wget $mp3url`;

}
}
unlink $filename;


hope it helps and save your time 👍

Install cv2 or opencv-python module in MACos

It took a while to figure out the issues during installing the OpenCV to my mac machine.
Here are the steps that I followed to fix it. maybe it could help you too...

I have opened the Terminal and gave "pip install OpenCV-python". Here the problem starts...

$ sudo -H pip install opencv-python

Password:

Collecting opencv-python

  Downloading https://files.pythonhosted.org/packages/ae/f7/01fc83414fbdbb470d6d77ee4a0fd32234046edc4a2e4f7897e3e95ee666/opencv_python-3.4.2.17-cp27-cp27m-macosx_10_6_x86_64.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl (42.2MB)

    100% |████████████████████████████████| 42.3MB 244kB/s 

Collecting numpy>=1.11.1 (from opencv-python)

  Downloading https://files.pythonhosted.org/packages/e7/c1/d5c47de35e366b1c2f60da88a24b25d3037b892417c5c3c5398313fb54f5/numpy-1.15.1-cp27-cp27m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl (24.5MB)

    100% |████████████████████████████████| 24.5MB 569kB/s 

matplotlib 1.3.1 requires nose, which is not installed.

matplotlib 1.3.1 requires tornado, which is not installed.

Installing collected packages: numpy, opencv-python

  Found existing installation: numpy 1.8.0rc1

Cannot uninstall 'numpy'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.

oops, here 😈 starts...
But no worries I got your back.

Here are the few steps that could solve it.

1) Install the tornado package.

$ sudo -H pip install tornado

Collecting tornado

  Downloading https://files.pythonhosted.org/packages/45/ec/f2a03a0509bcfca336bef23a3dab0d07504893af34fd13064059ba4a0503/tornado-5.1.tar.gz (516kB)

    100% |████████████████████████████████| 522kB 1.5MB/s 

Collecting futures (from tornado)

  Downloading https://files.pythonhosted.org/packages/2d/99/b2c4e9d5a30f6471e410a146232b4118e697fa3ffc06d6a65efde84debd0/futures-3.2.0-py2-none-any.whl

Collecting singledispatch (from tornado)

  Downloading https://files.pythonhosted.org/packages/c5/10/369f50bcd4621b263927b0a1519987a04383d4a98fb10438042ad410cf88/singledispatch-3.4.0.3-py2.py3-none-any.whl

Collecting backports_abc>=0.4 (from tornado)

  Downloading https://files.pythonhosted.org/packages/7d/56/6f3ac1b816d0cd8994e83d0c4e55bc64567532f7dc543378bd87f81cebc7/backports_abc-0.5-py2.py3-none-any.whl

Requirement already satisfied: six in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python (from singledispatch->tornado) (1.4.1)

Installing collected packages: futures, singledispatch, backports-abc, tornado

  Running setup.py install for tornado ... done

Successfully installed backports-abc-0.5 futures-3.2.0 singledispatch-3.4.0.3 tornado-5.1

2) Then install the nose package. "sudo -H pip install nose"

3) Actually, this should be the final step but as I have the older version of numpy. It has thrown a stone against 💣💣.

$sudo -H pip install opencv-python

Collecting opencv-python

  Using cached https://files.pythonhosted.org/packages/ae/f7/01fc83414fbdbb470d6d77ee4a0fd32234046edc4a2e4f7897e3e95ee666/opencv_python-3.4.2.17-cp27-cp27m-macosx_10_6_x86_64.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl

Collecting numpy>=1.11.1 (from opencv-python)

  Using cached https://files.pythonhosted.org/packages/e7/c1/d5c47de35e366b1c2f60da88a24b25d3037b892417c5c3c5398313fb54f5/numpy-1.15.1-cp27-cp27m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl

Installing collected packages: numpy, opencv-python

  Found existing installation: numpy 1.8.0rc1

Cannot uninstall 'numpy'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.

4) So to solve the above issue the numpy need to be updated.

$ sudo -H pip install --ignore-installed numpy

Collecting numpy

  Downloading https://files.pythonhosted.org/packages/e7/c1/d5c47de35e366b1c2f60da88a24b25d3037b892417c5c3c5398313fb54f5/numpy-1.15.1-cp27-cp27m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl (24.5MB)

    100% |████████████████████████████████| 24.5MB 642kB/s 

Installing collected packages: numpy

Successfully installed numpy-1.15.1

5) Now we are ready to install OpenCV

$ sudo -H pip install opencv-python

Collecting opencv-python

  Using cached https://files.pythonhosted.org/packages/ae/f7/01fc83414fbdbb470d6d77ee4a0fd32234046edc4a2e4f7897e3e95ee666/opencv_python-3.4.2.17-cp27-cp27m-macosx_10_6_x86_64.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl

Requirement already satisfied: numpy>=1.11.1 in /Library/Python/2.7/site-packages (from opencv-python) (1.15.1)

Installing collected packages: opencv-python

Successfully installed opencv-python-3.4.2.17

Hope this helps 👍 .....

Substring implementation in C

small code snippet of substring implementation in C, may save you time ..


 char *substring(int start, int finish, const char *inString) {

  int inlen = strlen(inString);
    char result[inlen];
    char tmp[2];
    int i,k;
    for (i=start,k=0;i<finish;i++,k++)
    {
    result[k]=inString[i];
    }
    return result;
}



Happy coding 👍😉

Operation not permitted in MAC OS for delete and move

While trying the delete or move operation in the command prompt, we faced a issue that even root user can't delete or move or rename the folder or file.

was 👀  looking in the found a solution.

May save your time too ...

Steps to resolve:

1) open a Terminal.
2) go to the previous directory in which you face issue. IN my cases ~/Download is the folder in which i can remove any, due to Operation not permitted issue.  So I have moved to /users/xxxx
3)  run the following command in sudo.

     sudo chflags -R nouchg,nouappnd ~/Downloads/ 

replace the folder in which you are facing issue in instead of ~/Downloads/  in above command.

Hope will this helped you 👍