Question

1. Write the command to set the following permissions on a script file with the following name; myscript.sh

Owner: full access; read, write and execute
Group: read and execute
Other: no access

2. Create a new file with the name "myfirstscript.sh". Write a new script that performs the following tasks in sequence;

1. Display the usernames of currently logged in users; sorted from a-z
   1. HINT: You will need to filter the output of the whocommand
2. Display a list of usernames who are logged into the system more than once
   1. HINT: usernames that are logged in more than once = not 'unique'
3. Display a list of usernames that have been logged in since yesterday

Also, provide the commands to;

1. Set read and execute permission for the user and member of the user’s group; read-only permission for others; and write permission for the user only
2. Run your script from it’s stored directory

Note: The output of your script must be self-explanatory. For example, the output for the users who are currently logged into the system must be preceded by a header like this: “List of users who are currently logged in to the system in alphabetical order”

3. Write a script that performs the following actions;

Define the following two variables with the provided values;
variable lab with value lab?
variable labs with value lab*
Display the value of lab and labs
Define a variable named price with a value of 84.5
Define a variable named sentence and use the price variable to set its value to "The price of the book is $84.5"

Answer 1

code:

echo "Usernames currently logged in sorted from a-z"

who -u | sort

echo "Usernames logged into the system more than once"

users | wc -w

echo "Usernames logged into the system since yesterday"

last –s ‘-1 day’ | sort

touch input.txt

echo "set permission”

chmod 754 myfirstscript.sh