Virtual environments in ubuntu using venv

Activate virtual environments in ubuntu using venv

https://linuxize.com/post/how-to-create-python-virtual-environments-on-ubuntu-18-04/

 

 

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vimrc and bashrc files

For the nth time, i have had to look up the location of the .vimrc and .bashrc files on windows . so here goes:

bashrc

• Just open git bash and do ‘ls -la’ to see the .bashrc file

vimrc

• C:\Program Files (x86)\Vim\_vimrc
  • (basically wherever u have installed gvim on your machine)

du command (Linux)

Note:

• du command hides hidden files.  A more convenient command is ‘ncdu‘
  • sudo apt-get install ncdu
  • Please refer to his link :
    • https://askubuntu.com/questions/356902/why-doesnt-this-show-the-hidden-files-folders

• To find whats contributing to the disk usage on a specific filesystem (/dev/sda2)
  • This can be tricky because there would be other filesystems mounted underneath /
  • I have found the package ‘xdiskusage‘ very useful for this.
  • This problem is discussed here

 

• If i need to look up directory sizes  only till 1 layer, then the following command is useful:
  • the ‘-s’ flag is useful to summarize the contents on directory

 

$ du -csh *
52K Desktop
4.0K Documents
4.0K Downloads
0 media
4.0K Music
353M notebooks
4.0K Pictures
4.0K Public
4.0K Templates
947M transferLearning
4.0K Videos
1.3G total

References:

https://www.cyberciti.biz/faq/checking-directory-size-in-linux-command/

 

Ubuntu Terminal Smarts

I think using the Ubuntu Terminal in a smart way is crucial for day-to-day productivity.

I came across this nice link where several tricks are listed down and explained nicely.

https://help.ubuntu.com/community/UsingTheTerminal

Note: The consistent Copy-Paste mechanism  I have found working across Unity terminal, Xfce terminal, unity gvim, xfce gvim etc is  using:

• Control + Insert : to copy
  • this is also same as ‘copy on select’ i.e. just select the text and it will be copied automatically.
• Shift + Insert : to paste

Check it out!

Ubuntu Learnings

Remote to Ubuntu 16.04 from Windows 10:

• http://ubuntuhandbook.org/index.php/2016/07/remote-access-ubuntu-16-04/
  • VNC approach : This shows the trick of how to get past the encyption error
  • I found that uVNC was much better than TightVNC for viewing
• atom editor has some issues over rdp. but there is a hack around it
  • https://github.com/atom/atom/issues/4360
• http://www.makeuseof.com/tag/how-to-establish-simple-remote-desktop-access-between-ubuntu-and-windows/
• http://www.technig.com/remote-access-windows-10-via-ubuntu-vise-versa/
• http://www.tweaking4all.com/software/linux-software/use-xrdp-remote-access-ubuntu-14-04/
  • RDP approach : this approach would use the the xfce desktop environment 
• http://c-nergy.be/blog/?p=9962
  • RDP approach : apparently you can get the Unity desktop using these steps. But I havent tried it out

Copy On Select:

• http://askubuntu.com/questions/211292/a-terminal-which-provides-select-to-copy-and-right-click-to-paste
• http://superuser.com/questions/307339/can-i-make-ubuntus-terminal-program-automatically-copy-to-the-clipboard-selecte
  • Anything you highlight in Linux, regardless of the program, is put into a special clipboard buffer, which you can paste using your mouse’s middle (wheel) button

Install Java

• http://www.wikihow.com/Install-Oracle-Java-JDK-on-Ubuntu-Linux
  • Only care about JDK.

profile and bashrc files

• http://bencane.com/2013/09/16/understanding-a-little-more-about-etcprofile-and-etcbashrc/
  • This is a very interesting read!

abgoswam@abgoswam-ubuntu:~$ ls .bash* -lh
-rw------- 1 abgoswam abgoswam 4.1K Oct 23 15:20 .bash_history
-rw-r--r-- 1 abgoswam abgoswam  220 Oct 21 22:44 .bash_logout
-rw-r--r-- 1 abgoswam abgoswam 3.7K Oct 21 22:44 .bashrc

abgoswam@abgoswam-ubuntu:~$ ls .profile* -lh
-rw-r--r-- 1 abgoswam abgoswam 655 Oct 21 22:44 .profile

abgoswam@abgoswam-ubuntu:~$ ls -lh /etc/profile*
-rw-r--r-- 1 root root  670 Oct 23 14:55 /etc/profile
-rw-r--r-- 1 root root  884 Oct 23 15:18 /etc/profile.save

/etc/profile.d:
total 20K
-rw-r--r-- 1 root root   40 Nov 30  2015 appmenu-qt5.sh
-rw-r--r-- 1 root root  101 Jun 29 12:03 apps-bin-path.sh
-rw-r--r-- 1 root root  663 May 18 02:19 bash_completion.sh
-rw-r--r-- 1 root root 1003 Dec 29  2015 cedilla-portuguese.sh
-rw-r--r-- 1 root root 1.9K Mar 16  2016 vte-2.91.sh

abgoswam@abgoswam-ubuntu:~$ ls -lh /etc/bash*
-rw-r--r-- 1 root root 2.2K Aug 31  2015 /etc/bash.bashrc
-rw-r--r-- 1 root root   45 Aug 12  2015 /etc/bash_completion

Gvim

• http://superuser.com/questions/10588/how-to-make-cut-copy-paste-in-gvim-on-ubuntu-work-with-ctrlx-ctrlc-ctrlv
• https://www.quora.com/How-do-you-work-out-where-the-vimrc-file-is-in-Ubuntu

Making Gvim auto open in new tab:

• http://lifepluslinux.blogspot.com/2014/09/open-file-in-existing-gvim-in-new-tab.html
• http://vim.wikia.com/wiki/Launch_files_in_new_tabs_under_Unix  (just create an alias)
  • the gvim.desktop way of doing it never worked for me

 

Spark:

• http://askubuntu.com/questions/635265/how-do-i-get-pyspark-on-ubuntu
• https://districtdatalabs.silvrback.com/getting-started-with-spark-in-python
• https://www.tutorialspoint.com/apache_spark/apache_spark_installation.htm
• https://www.youtube.com/watch?v=uhVYTNEe_-A

Ubuntu Linux Installation Troubleshoot

I tried installing Ubuntu 16.04 on my Lenovo X1 Carbon. It’s interesting how hard it was to install Linux on this machine.

USB stick:

• Not possible! I spent several frustrating hours trying it out. Looks like the option to boot from a USB stick is not there in the BIOS.
• The Ubuntu installation guide does mention that there might be issues installing from USB stick.
• https://help.ubuntu.com/16.04/installation-guide/

NetBoot:

• Took me back to my days at Cisco, doing all the gory networking stuff.
  • This is the next thing I tried out, and I spent countless hours on it!
• https://help.ubuntu.com/community/TFTP
• http://cdimage.ubuntu.com/netboot/16.04.1/?_ga=1.73326611.1880033183.1476136066
• https://help.ubuntu.com/lts/installation-guide/armhf/ch04s03.html
• https://help.ubuntu.com/community/Installation#Server and network installations
• Linux:
  • http://www.ostechnix.com/how-to-install-pxe-server-on-ubuntu-16-04/
  • http://www.ostechnix.com/install-dhcp-server-in-ubuntu-16-04/
  • https://help.ubuntu.com/community/Installation/LocalNet
• Windows:
  • https://help.ubuntu.com/community/Installation/WindowsServerNetboot

 

 

Netstat, Telnet

In my past life I was so used to using the ‘netstat’ command. So I found it funny when I got to re-use it again after ~5 years.

Netstat:

• netstat -nltp
• netstat -rn

netstat [address_family_options] [–tcp|-t] [–udp|-u] [–raw|-w] [–listening|-l] [–all|-a] [--numeric|-n] [–numeric-hosts] [–numeric-ports] [–numeric-users] [–symbolic|-N] [–extend|-e[–extend|-e]] [–timers|-o] [–program|-p] [–verbose|-v] [–continuous|-c]

netstat {–route|-r} [address_family_options] [–extend|-e[–extend|-e]] [–verbose|-v] [–numeric|-n] [–numeric-hosts] [–numeric-ports] [–numeric-users] [–continuous|-c]

 

There are so many more flags (see reference)

Telnet:

• used telnet to verify connectivity with zookeeper
• at the telnet prompt, type in ruok and press ENTER. if everything’s fine, ZooKeeper will say imok and end the Telnet session

References:

• http://www.computerhope.com/unix/unetstat.htm
• http://www.computerhope.com/unix/utelnet.htm