CS 4010 Lab 4

CS 4010 Spring 2019

Lab 4

Find a computer and log into the OSX side using your CS login name and password.

Open Firefox and find the class web page.

Open TextWrangler - use the finder window and go to applications.
Open a new text file, called Lab4.txt, to record your work today - you will paste in some of your command lines. The header of the file should look like:

Your Name
CS 4010
Lab 4
February 25, 2019

Find the Terminal - use the finder window and go to applications and then utilities.

How to change your shell to bash and create .bash_profile

If you have not already done this, here is a way that users can change their terminal to bash:

chsh -s /bin/bash

Then you have to enter your user password and open a new terminal window to see the changes.

How-to create a bash_profile:

Start up Terminal
Type "cd ~/" to go to your home folder
Type pwd to make sure you are in your home folder THIS IS VERY IMPORTANT
Type "touch .bash_profile" to create your new file.
Edit .bash_profile with nano, pico, or TextWrangler.
Type "source ~/.bash_profile" to reload .bash_profile and update any functions you add. (You can also open a new terminal window.)

Now we will add three things to your .bash_profile:

A path to your scripts directory
A noclobber statement
An alias to your sandbox

Be sure to past each command you use into your Lab4.txt file.

A path to your scripts directory:
Check your existing path:

echo $PATH

Adding to the path in your .bash_profile you can edit your bash profile using pico .bash_profile you will need to modify the path shown below:

PATH="${PATH}:/Users/mmartin/teaching/Spring_2018/4010/Book/pcfb/scripts"
export PATH

Check your path again to see that it was added correctly

A noclobber statement
This changes the system settings to give you a warning before cp, mv, and > overwrite files.
See the box at the bottom of page 87.
Edit your bash profile using pico .bash_profile to add the line shown below:

set -o noclobber

An alias to your sandbox
This will allow you to use a shortcut for long commands - see page 99

Create an alias to get to your sandbox directory from the terminal (you might want to call it cdsand)
Test it in the terminal
Once you are satisfied it works add it to your .bash_profile
Open a new shell and test it again.

Now we want to write scripts:
Write a script: the goal is to create and run the script on page 89 to list the directory contents.

First you will need to create a scripts directory
Next edit your path to include that directory
Now write the script and save it to your scripts directory as dir.sh
Check that the file has execute permissions
Finally test it on some directories

Copying file in bulk: work through the example starting on page 92

Automating curl to retrieve literature references: if you have time work through example starting on page 97

Turn it in:
Go to the CS Homework Submission System: https://www.cs.csustan.edu/cshomework/
Choose: instructor Martin
            Spring 2019
            CS4010
              Lab4
Upload the your Lab4.txt file as prompted.