Question

I need help with the following Linux bash assignment:

Display the value of all environment variables to the screen.

Add a temporary environment variable called Semester with a value of Spring to your currently running shell only.

Modify your .bashrc file to create an environment variable called CLASS with a value of "CIS 220" that is available to all processes.

Modify your .bashrc file to add $HOME/scripts to your path without removing any other items from your path.

Modify your .bashrc file to add an alias named howmany that will use the who command to print the login names and a count of the currently logged in users. (Use the who man page to see how to do this.)

Modify your .bashrc file to add a function named newdir that will make a new directory AND set it as the current working directory. It should get the directory name via a parameter.

Answer 1

Display the value of all environment variables to the screen : Use the printenv command

Add a temporary environment variable called Semester with a value of Spring to your currently running shell only.:

export Semester = Spring

Modify your .bashrc file to create an environment variable called CLASS with a value of "CIS 220" that is available to all processes.

vim ./bashrc

Add : export CLASS="CIS 2020"

source ./bashrc

Modify your .bashrc file to add $HOME/scripts to your path without removing any other items from your path.

vim ./bashrc

export PATH = $PATH:$HOME/scripts

source ./bashrc

Modify your .bashrc file to add an alias named howmany that will use the who command to print the login names and a count of the currently logged in users.

vim ./bashrc

alias howmany = 'who -q -H'

source ./bashrc

Answer 2

#Display the value of all environment variables to the screen.Type the below command on the screen:

env

#------------------------------------------------

#Add a temporary environment variable called Semester with a value of Spring to your currently running shell only

export Semester="Spring"

echo $Semester

#------------------------------------------------

# The rest of the assignment requires changes to .bashrc
# In your home directory, open the .bashrc file using vim
cd
vi .bashrc

#------ Add everything below to your .bashrc file ------------

#Modify your .bashrc file to create an environment variable called CLASS with a value of "CIS 220" that is available to all processes.

export CLASS="CIS 220"

#Modify your .bashrc file to add $HOME/scripts to your path without removing any other items from your path.

export PATH=$PATH:$HOME/scripts

#Modify your .bashrc file to add an alias named howmany that will use the who command to print the login names and a count of the currently logged in users. (Use the who man page to see how to do this.)

alias howmany='who -u; echo "The number of logged in users is `who | wc -l` " '

#Modify your .bashrc file to add a function named newdir that will make a new directory AND set it as the current working directory. It should get the directory name via a parameter.

function newdir()
{
newCurrDir="$1"
if [[ -d "$newCurrDir" ]]
then
echo "$newCurrDir : Directory already exists. Will change to it anyway"
else
mkdir -p "$newCurrDir"
cd "$newCurrDir"
echo "Changed Directory to `pwd` "
fi
}

#------ Save the .bashrc file and exit. Open a new terminal and log in

#-------------------- How to test -------------------------

# In your new terminal, type the below commands one by one:
echo $CLASS

echo $PATH

howmany

newdir "This_be_me_new_dir"

# A new dir called This_be_me_new_dir is created and the current dir will be changed to it
# On your screen, you will see something similar to the following: