Different shell prompt than usual in Linux terminal

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• New Yocto Recipe Builds but Work Directory is Deleted after Compilation

  I am trying to update the recipe for zbar from 0.10.0 to 0.20.1. Here is the original recipe:

  https://github.com/openembedded/meta-openembedded/blob/master/meta-oe/recipes-support/zbar/zbar_0.10.bb

  My modified recipe is at the bottom of this question. The package does compile, but the problem is that something happens during the "packaging" step and the "work" directory is wiped out except for the "temp" directory inside the "work" directory. During compilation, if I list the files in the work directory, everything I expect is present, but after compilation succeeds, something cleans the files up. What am I doing wrong?

  During compilation:

  user@ubuntu:~/rpi/build/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/zbar/0.20.1-r0$ cd ../0.20.1-r0/ ; ls
  build              image            pkgdata                sysroot-destdir
  configure.sstate   license-destdir  pseudo                 temp
  debugsources.list  package          recipe-sysroot
  git                packages-split   recipe-sysroot-native
  

  After Compilation:

  user@ubuntu:~/rpi/build/tmp/work/cortexa7hf-neon-vfpv4-poky-linux-gnueabi/zbar/0.20.1-r0$ cd ../0.20.1-r0/ ; ls
  temp
  

  Yocto Recipe:

  DESRIPTION = "2D barcode scanner toolkit."
  SECTION = "graphics"
  LICENSE = "LGPL-2.1"
  
  DEPENDS = "pkgconfig intltool-native libpng jpeg"
  
  LIC_FILES_CHKSUM = "file://LICENSE;md5=243b725d71bb5df4a1e5920b344b86ad"
  
  S = "${WORKDIR}/git"
  
  SRCREV = "edcf08b49e0a5fe71c18fa9d4b8ed83ed8fc9082"
  SRC_URI = "git://github.com/mchehab/zbar.git"
  
  inherit autotools pkgconfig
  
  EXTRA_OECONF = " --without-x --without-imagemagick --without-qt --without-python2 --disable-video --without-gtk"
  
  FILES_${PN} += "${bindir}"
  FILES_${PN} += "${libdir}"
  
  do_install_append() {
      echo "done..."
  }
  
• Visual Studio Code Python Debugger Seg Fault

  I've installed VS Code version 1.28.1 on CentOS 7.2.1511. Python extension is installed. Interpreter is set to Python 3.5.1 64-bit. Installed ptvsd version is 4.1.3. I'm launching vscode via putty from a Windows desktop, but essentially I'm running and debugging on the Centos system.

  I've followed the python tutorial for building a simple app. When I select and run "Python: Current File (Integrated Terminal)", I get the following seg fault in the integrated terminal:

  user@machine: cd /home/user/hello ; env "PYTHONIOENCODING=UTF-8" "PYTHONUNBUFFERED=1" /usr/local/bin/python3 /home/user/.vscode/extensions/ms-python.python-2018.9.0/pythonFiles/experimental/ptvsd_launcher.py 52056 /home/user/hello/hello.py
  Segmentation fault (core dumped)
  

  Followed by a popup window with the message "Timeout waiting for debugger connection".

  launch.json config:

  {
      "name": "Python: Current File (Integrated Terminal)",
      "type": "python",
      "request": "launch",
      "program": "${workspaceFolder}/hello.py",
      "console": "integratedTerminal",
      "stopOnEntry": true
  }
  

  I've seen the github issues but they seem dated. ptvsd.enable_attach() no longer has a "secret" keyword. I've tried adding combinations of these to the script being debugged:

  import time
  import ptvsd
  ptvsd.enable_attach()
  time.sleep(10)
  ptvsd.wait_for_attach()
  

  I've also tried several launch configs. Am I missing something here? Is this just a buggy debugger?
• Debian goes black screen when installing

  I'm using virtual box for debian and I created my virtual machine but when I click to install my screen turns black and it also happens when I tried ubuntu.

  

  How can I solve it?
• In fish shell how to check if a variable is a number?

  How to check if a variable is a number in fish shell? Looking for a simple way of doing it.
• I'm writing a client that needs to ask to get a specific data from a website

  I don't know how to ask that website for that specific data using c programming language!
• How to extract multiple values from a line of particular fields using awk?

  I am having a file "file1.txt" which is having the data as follows:

  rahul 1994 Australia 40000
  akash 2000 India 50000

  Now i want to extract values of field 1 and field 4 in some variable.
  I am doing it as follows:

  while read line  
  do  
    name=$(awk '{print $1}'<< "$line")  
    salary=$(awk '{print $4}'<< "$line")  
    echo $name $salary
  done < file1.txt
  

  So i want to ask that can i assign values to name and salary by using only one awk command?
• What is the "0G" terminal sequence

  I have come across a lot of bash PS1 prompts like this export PS1="\[\033[0G\]${PS_INFO} ${PS_GIT}${PS_TIME}\n${RESET}\$ "

  For some reason, virtualenv name printing was messing up in my terminal and was fine after I removed the [\033[0G\] from the beginning.

  But what is the purpose of [\033[0G\]? Do I need it?
• what's these output numbers of this c program in linux termanl? do they have any relation? why in every runing they're changing?

  we compile the code blow by : gcc Cprogram.c -o cprogram in linux terminal

  #include <stdio.h>
  #include <sys/types.h>
  #include <unistd.h>
  int main(void)
  {
      pid_t pid,ppid;
      pid = getpid();
      ppid = getppid();
      printf("\n1-%d\n",pid);
      printf("\n2-%d\n",ppid);
      fork();
      pid = getpid();
      ppid = getppid();
      printf("\n3-%d\n",pid);
      printf("\n4-%d\n",ppid);
      return 0;
  }
  

  then we got this by : .\Cprogram :

  1-2457
  
  2-1745
  
  3-2457
  
  4-1745
  3-2458
  
  4-2457
  

  whats these numbers ? whats their relation together? and why they're changing in every running ?

  sorry about type mistakes:)
• Ubuntu terminal has only cursor and can't type

  I have an issue with Terminal. I load it up and all I get is the purple background and a blinking cursor. Not sure what the problem is. I was attempting to run atom.io earlier and run some C code through it but that didn't seem to work. Hope someone can shed some light on this problem.

  Thanks in advance
• how to appear command prompt like C language

  hello? i'm beginner of java programming. Why doesn't the command prompt appear when Java compiles itself like C language? i want to know how.
• Python 3.7 working in command prompt but not IDLE or python.exe

  I am working on Windows and am just trying to get it up and running. I try the test of "python --version" and it works in the command prompt, but within IDLE or Python.exe I get "NameError: name 'python' is not defined"