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Intro

Ubuntu seems to be the data science standard now.

Terminal windows

  • You pretty much do all system stuff via the terminal with good old Linux commands
  • Ctrl-Shift-V to paste

Installing Chrome

  • The automatic installd did not work
  • Downloaded the deb package (google-chrome-stable_current_amd64.deb) from google into ~/Downloads
  • Installed gdebi with sudo apt-get install gdebi
  • Installed chrome with sudo gdebi -i google-chrome-stable_current_amd64.deb
  • Found “Google Chrome” in /usr/share/applications

Drivers

  • You can see your driver version with cat /proc/driver/nvidia/version
  • You can also see it with nvidia-smi if you have Cuda installed on windows or Ubuntu (but not on L4T apparently)
  • You can set the drivers via the GUI
    • Select System & Updates - a dialog will then open up
    • Then select the Additional Drivers Tab
    • It claims the NVIDIA binary drivers are open source but I have my doubts.

RDP (Remote Deskttop from Windows)

  • For a long time this did not work at all as Ubuntu uses a Desktop Environment as opposed to a window manager.
  • There are two ways to do remote desktop, VNC or RDP (the latter is kind of Windows specific and has better graphics than Generic VNC which is JPEG vased).
  • TigerVNC (derived from the older TightVNC) apparently supports RDP too.
  • Install xrdp
  • Install TigerVNC on Ubuntu (https://github.com/TigerVNC/tigervnc/releases)
  • TigerVNC Ubuntu Install instructions
  • Note that in bintray there are binaries just fur Ubuntu
  • Had to install with gdebi to get the dependencies installed.
  • Useful post setting screen size is here

Scripts

  • write scripts and dump then in your ~/bin directory to save typing
  • begin then with #!/bin/bash remember “shebang bin bash”
  • you can’t used them to change directory unless you run them in your shell with a dot command like . cdobjdet

VNC

  • Finally got something working, but it is not great.

Ubuntu:

  • installed mir on Ubuntu with sudo apt-get install unity8-desktop-session-mir
  • this was a heavy install that apparently installs the unity8 desktop (although I did not see it)
  • Changed the configuration to enable remote desktop with “dconf-editor”
  • under org.gnome.desktop.remote-access set the “enabled” checkbox
  • You then get a connection, but the tiger vncclient complains there is no matching encription
  • you can get a connection by settting “require-encryption” above to false
  • Left it disabled for now
  • Next steps: substitute tigervnc for vino-server

Windows:

  • Installed tigervnc on windows
  • used the tigervnc “vncviewer” to connect to the server addess and port 5900

NoMachine

  • I gave up on all that VNC stuff when I found NoMachine.
  • It has a client, start in Windows with Windows Key and then type “NoMachine”
  • It is commercial, but free for home use

Misc Unix commands

  • find a library file - find / -name lib*
  • find a library file locally - find . -name lib*
  • grep stuff files - grep -r tqdm *.py .
  • find files with a mask - find . -path "*/src/*.h"
  • find files with masks - find . -path '*/src/*.h' -o -path '*/src/*.cpp'
  • find files and pipe to grep - find . -path '*/src/*.h' -exec grep PATTERN {} \;
  • same with filename and line - find . -path '*/src/*.h' -exec grep -Hn PATTERN {} \;
    • see this https://unix.stackexchange.com/questions/131535/recursive-grep-vs-find-type-f-exec-grep-which-is-more-efficient-faster
  • Another example of finding with grep: find . -path '*.mk' -type f -exec grep -i 'UBUNTU_PKG_NAME =' {} +
  • After finding things we need to change: find . -path '*.mk' -type f -exec sed -i 's/nvidia-367/nvidia-384/g' {} \;
  • change field 3 to AD - awk '{$3 = "AD"; print}' infile > outfile
  • lookin in markdown for a whole word pattern ‘iot’ with file name and line number – find . -name '*.md' -exec grep -Hn -w iot {} \;
  • count how many hits – find . -name '*.md' -exec grep -w iot {} \; | wc -l
  • ls just directories: ls -d */

File manager

  • Under Ubuntu it is called nautilus
  • If it doesn’t open, try killing the process and restarting
  • for command line too long
    • for f in *.pdf; do chmod 664 "$f"; done

Terminal Window

  • Note that the “super” key is the “windows” key in the docs.
  • Open Terminal Window - Ctrl-Alt-T
  • Paste into Terminal Window - Ctrl-Shift-V
  • Other shortcuts can be found here
  • for persistent terminal windows see ssh.md

System trace

  • use strace for tracing system calls
  • try strings first

Get BIOS Information

  • sudo dmidecode grep “BIOS Information” -A10 grep -e “Version:” -e “Vendor:”

Applications

  • Application launch icons can be found in /usr/share/applications

Perf monitoring

Installation

  • Followed instructions on Ubuntu site to burn USB stick to boot from
  • Downloaded an ISO and put it on there
  • Needs a live Internet connection apparently (uses DHCP)
  • Couldn’t boot from the stick in Hyper-V because the USB drive has no pass-thru functionality (oddly)
  • Installation straightforward
  • Installed Chrome next (via Firefox)

Grub

  • config in /etc/local/grub