EE160 Programming for Engineers

• in the future, everything will be run be computers, electronics, and software
• understanding programming and how programs work will give you the power to build and create the programs of the future
• it's pretty cool to watch your robot or program do something that would've taken a human hours (if not more) to do
• here's why others think you should program: http://www.youtube.com/watch?v=nKIu9yen5nc&feature=player_embedded

• learn the basics of programming
• learn how to engineer solutions to problems using programs
• we will be using the C language to understand core programming concepts
• learning the basics of the C programming language, you can learn any other program pretty simply

https://zhaol.github.io/ee160/

Basic Commands:

• pwd: print working directory

  • example usage:
    • pwd

      outputs:

      • /Users/568531/01_hello_world

      • /var/lib/stickshift/51f0e4a65973ca200700011e/app-root/data/568531/01_hello_world

  • more info:
    • http://linux.about.com/library/cmd/blcmdl1_pwd.htmd

• cd: change directory

  • the cd command does not generate any output
  • if you print the current directory with pwd, it'll show a change in the working directory if cd was successful
  • example usage:
    • cd ee160_directory

      will change to ee160_directory under current working directory

    • cd ee160_directory/subdirectory

      will change to subdirectory under ee160_directory (with ee160_directory being under the current working directory)

    • cd ~ or cd

      will change to home or user root directory, i.e. highest level acessible from user account

    • cd ..

      will change to parent directory, i.e. up one level

    • cd /

      will change to system root directory, i.e. highest level accessible

  • more info:
    • http://linux.about.com/od/commands/a/Example-Uses-Of-The-Command-Cd.htm

• mkdir: make directory

  • the mkdir command does not generate any output
  • if you list the current directory with ls, it'll show the added directory if mkdir was successful
  • example usage:
    • mkdir ee160_directory

      will make ee160_directory under the current working directory

    • mkdir ee160_directory/subdirectory

      will make subdirectory under ee160_directory (with ee160_directory being under the current working directory)

  • more info:
    • http://linux.about.com/library/cmd/blcmdl1_mkdir.htm

• ls: list directory content

  • example usage:
    • ls

      outputs:

      • Gemfile         Gemfile.lock    _config.yml     _includes       _layouts        _posts          _site           css             index.html      js              labs            lectures

    • ls -la

      outputs:

      • total 56
        drwxr-xr-x  16 Gina  staff    544 Aug  2 18:07 .
        drwxr-xr-x   3 Gina  staff    102 Jul 20 13:11 ..
        drwxr-xr-x  13 Gina  staff    442 Aug  3 07:58 .git
        -rw-r--r--   1 Gina  staff      5 Jul 20 19:16 .gitignore
        -rw-r--r--   1 Gina  staff    223 Jul 20 13:05 Gemfile
        -rw-r--r--   1 Gina  staff    992 Jul 20 13:06 Gemfile.lock
        -rw-r--r--   1 Gina  staff     93 Jul 20 19:28 _config.yml
        drwxr-xr-x   3 Gina  staff    102 Aug  2 08:55 _includes
        drwxr-xr-x   3 Gina  staff    102 Jul 20 19:28 _layouts
        drwxr-xr-x   2 Gina  staff     68 Jul 20 13:31 _posts
        drwxr-xr-x   9 Gina  staff    306 Aug  3 15:26 _site
        drwxr-xr-x   4 Gina  staff    136 Aug  3 08:16 css
        -rw-r--r--   1 Gina  staff  11203 Aug  2 18:07 index.html
        drwxr-xr-x   3 Gina  staff    102 Aug  3 08:15 js
        drwxr-xr-x   3 Gina  staff    102 Jul 26 08:55 labs
        drwxr-xr-x  24 Gina  staff    816 Jul 27 00:29 lectures

  • more info:
    • http://linux.about.com/od/commands/l/blcmdl1_ls.htm
    • in Windows: the command is dir

• touch: update file timestamp

  • the touch command does not generate any output
  • if you list the directory the file is in with ls, it'll show a new timestamp (the time when the file was touch'd), for all touch'd files
  • we'll use it to create an empty file
  • example usage:
    • touch new_file.c

      will make new_file.c under the current working directory

    • mkdir ee160_directory/new_file.c

      will make new_file.c under ee160_directory (with ee160_directory being under the current working directory)

  • more info:
    • http://linux.about.com/od/commands/l/blcmdl1_touch.htm

• rm: remove file

  • the rm command does not generate any output
  • if you list the directory the file was originally in with ls, it'll no longer show the rm'd file in the directory, if rm was successful
  • example usage:
    • rm file_to_be_deleted.c

      will remove file_to_be_deleted.c from the current working directory

    • rm ee160_directory/file_to_be_deleted.c

      will remove file_to_be_deleted.c under ee160_directory (with ee160_directory being under the current working directory)

    • rm -rd ee160_directory

      will remove all subdirectories and their files under ee160_directory, including ee160_directory (with ee160_directory being under the current working directory)

      r flag is for recursive, e.g. files under subdirectories

      d flag is for directories, i.e. delete directories as well

  • more info:
    • http://linux.about.com/od/commands/l/blcmdl1_touch.htm

• mv: move file

  • the mv command does not generate any output
  • if you list the origin directory with ls, it'll no longer show the mv'd file in the directory, if mv was successful and the file wasn't moved to the same directory
  • example usage:
    • mv file_to_be_moved.c moved_file.c

      will rename file_to_be_moved.c to moved_file.c in current directory

      essentially just renamed the file

    • mv ee160_directory/file_to_be_moved.c ee160_directory/subdirectory/.

      will move file_to_be_moved.c under ee160_directory (with ee160_directory being under the current working directory) to subdirectory (under ee160_directory, which is under current directory)

      the name of the file will be the same because of .

  • more info:
    • http://linux.about.com/library/cmd/blcmdl1_mv.htm

Extras:

• help: help

  • example usage:
    • help pwd

      outputs:

      pwd: pwd [-LP]
      Print the current working directory.  With the -P option, pwd prints
      the physical directory, without any symbolic links; the -L option
      makes pwd follow symbolic links.

• tab: auto-complete

  • pressing tab will show all auto-complete options or will auto-complete if there's only 1 option
  • useful in conjunction with cd to show available directories

• up: previous command in history

  • pressing up will show last command in history

  • keep pressing up until you find the command in history you want to execute
  • when you've reached the desired command, press enter to execute command
  • pressing down will go in reverse order
  • to start new command, press down until there's no more commands in the command prompt

More Info:

• Cloud9 gives you access to an Ubuntu Linux Terminal
• Dr. Sasaki's Unix Introduction can also be helpful in getting you started
  • Unix is very similar to Linux; read more here and here
  • If you decide to not use Cloud9 and would rather use UH's Wiliki, then Dr. Sasaki's Introduction can help you get set up

Homework Assignment 1.1, at the end of this assignment there is nothing to turn in

Sign up for UH username/email:

• https://myuh.hawaii.edu:8888/sessionid=nobody/am-sso-check-status
• UH email needed to access class account on Piazza

Sign up for Wiliki account:

• A Wiliki account is needed to access the lab computers so please do this before your first lab session
  • you can get a Wiliki account at Student Services in Holmes Hall 250
  • if your Wiliki account still needs a couple more days to obtain, then ask for a guest Wiliki account to use for the time being

Sign up for Piazza:

• Sign up for free account at http://piazza.com
• Sign in to EE160 under University of Hawaii http://piazza.com/hawaii

Sign up for Cloud9 IDE:

• Sign up for free account at https://c9.io/web/sign-up/free
• Create a new workspace:
  • Name your workspace with lastname_firstname_uhid (e.g. li_zhao_12345678)
  • Make your workspace private; do not make it Open and Discoverable
  • If you get stuck, follow these instructions
  • Verify the workspace has the following lock icon to ensure the workspace is private:
    
• Once inside the newly created private workspace, open a terminal and run wget -O - https://raw.githubusercontent.com/zhaol/ee160_scripts/master/bootstrap.rb | ruby
• Use the command line commands listed above (Command Line Section), to create the following folder structure and files under ee160/homeworks/01_1:
  
• If you have an intermittent internet connection or just don't like using Cloud9, then you can look into setting up an alternate development environment

This video walks through how to setup your workspace: How to boostrap your workspace