Write a program that displays all environment variables

Assignment Help Computer Engineering

Reference no: EM131876600

Problem

1. Write a program that displays all environment variables.

2. Write a program that sets an int variable x to 100 before forking a child. Next perform the following in the child and parent: Child:

(i) Display the value of x, reset it to 200, and display it again.

(ii) Display the value of PATH, reset it to only ., and display it again.

(iii) Change the current directory to /etc and display the absolute pathname of the changed directory.

Parent:

(i) Sleep for 2 seconds.

(ii) Display the value of x, PATH, and the pathname of the current directory.

Explain your observations. Why was the parent made to sleep for two seconds?

Reference no: EM131876600

Questions Cloud

Calculate net sales : Net Sales Based on the following, calculate net sales? Gross Profit and Net Income From the following information, calculate Gross Sales?

Calculate the present value of net benefits : Calculate the present value of net benefits for the project using the analysts' predictions.

What behaviors are used to demonstrate that resistance : What lessons can you take from this experience concerning the nature of resistance and methods for overcoming resistance to change?

What is the total annual cost of setting up production runs : The new Toyota production plant starting up in Guanajuato, in central Mexico would be manufacturing a radical new Corolla Compact that will go on sale in 2020.

Write a program that displays all environment variables : Write a program that displays all environment variables. Write a program that sets an int variable x to 100 before forking a child.

What is role of memory management unit in process switching : What is the role of the Memory Management Unit in process switching? Why can't one process corrupt the address space of another?

Explain why a pipe can connect two related processes only : Why can't a background process be terminated with the interrupt key? Explain why a pipe can connect two related processes only.

Write a shell script containing only one statement : Write a shell script containing only one statement: exit 123456. Run the script and then invoke echo $? from the shell.

Write program that display pids and ppids of three processes : Write a program that forks twice. Display the PIDs and PPIDs of all three processes. Write a program that executes command wc -l -c /etc/passwd using execl.

User Account

All Pages