4. UNIX (Putty) please example all the questions, please show with program, also i'm stuck, i was told to use " chmod +x hw1p1q1.sh ( in my directory i only have hw1p1q1 but i don't know where to find '.sh' and what it is) "

Scripting with if statement: Commands to study to answer this question: sleep, ps, kill, echo, cat, creating your own shell variable, if statement, and two-character shell variable $! and $?

1) Exit from script, if is currently enabled; if it is not enabled, skip this item (1)

2) Using the vi editor, create a shell script file to do the following:

a) Issue sleep 1500 & command to run it as a background process.

b) The two-character shell variable $! contains the process ID (pid) of the above sleep process running in the background. Display the content of the variable $!.

c) Issue ps command to see that the sleep process is running.

d) Store the sleep process ID (pid) in a user defined (your own) shell variable

e) Issue cat command with a filename that does not exist

f) The two character shell variable, $? Contains the completion status of the previous cat command. Using an if statement, check the completion status of the above cat command by checking the value of $?. If cat command is successful, then echo cat command completed successfully else echo cat command failed.

g) Kill the background process with pid stored in your shell variable above as the argument to kill command

h) Issue ps command to see that the background process is terminated.

i) Echo, the script is done using echo command

3) Issue script command to capture the output of the items below

4) Add execute permission to the file

5) Display the attributes of the script file

6) Display the content of the script file

7) Run the script file by typing the name of the script file.

NOTE: You must submit both the content of the shell script file and the output generated by running the script