[seegu]

How to write these shell scripts?

Menu options are as follows:

1.Lookup help on a command using man
2.Display file system disk space usage in megabytes
3.Display memory usage in megabytes with a line containing totals
4.List all current processes
5.Monitor top system processes
6.Display system uptime
7.Exit User Menu

[Squashman]

Why do you need this. Sounds like it would just slow a person down by using a menu to select from.

[codejockey]

You will need some form of a while loop to control the overall logic (for example, a loop that executed as long as the selection was not "exit"). On each iteration of the loop, you will display the menu of choices, accept the user input, validate the input, and execute the associated command. When the command completes, control should return to the top of the loop (re-display menu, etc.).

Depending on how you choose to structure your program, you will need shell constructs such as while, read, if-then and case. Why not start with one of the options that you feel comfortable with, and write a script that will prompt for input ("should I execute this command Y/N?"), read and validate the response, and execute the command if requested. Once you've done one, you'll be well on your way to coding the complete menu system.

Hope this helps.

[seegu]

Originally posted by LwdSquashman:
Why do you need this. Sounds like it would just slow a person down by using a menu to select from.

It is my linux exercise. i have to finish it by this week.

[seegu]

Originally posted by codejockey:
You will need some form of a while loop to control the overall logic (for example, a loop that executed as long as the selection was not "exit"). On each iteration of the loop, you will display the menu of choices, accept the user input, validate the input, and execute the associated command. When the command completes, control should return to the top of the loop (re-display menu, etc.).

Depending on how you choose to structure your program, you will need shell constructs such as while, read, if-then and case. Why not start with one of the options that you feel comfortable with, and write a script that will prompt for input ("should I execute this command Y/N?"), read and validate the response, and execute the command if requested. Once you've done one, you'll be well on your way to coding the complete menu system.

Hope this helps.

Yes, it is help! thank you very much!!

Actually it's shame i dont know any about shell script, i just
started to learn linux last week. but i have to finish this
exercise by this week...so i quite worry

[Squashman]

I found this little menu driven script. You could probably edit it to do what you want it to do.

[codejockey]

I suspect that if you post your code and ask specific questions about whatever problems you are having, folks here will be more than happy to help. Good luck on your assignment -- Linux/Unix can be difficult to learn, but rewards careful study many times over.

[seegu]

I have just finished my script...but i dont know is it right.
Could anyone possible to check for me?
Thank you very much!!!

[codejockey]

You can check for syntax errors by invoking your script as:

sh -n scriptname

and you can run your script with each line printing (with variable substitution) as it executes by invoking your script as:

sh -x scriptname

These are excellent debugging tools. If you are still having trouble, post your script with your specific question(s), and I'm sure you'll find people willing to help you.

[seegu]

Originally posted by codejockey:
You can check for syntax errors by invoking your script as:

sh -n scriptname

and you can run your script with each line printing (with variable substitution) as it executes by invoking your script as:

sh -x scriptname

These are excellent debugging tools. If you are still having trouble, post your script with your specific question(s), and I'm sure you'll find people willing to help you.

I don't have linux at my machine, but i can try next monday at uni Cheers

[seegu]

Originally posted by codejockey:
You can check for syntax errors by invoking your script as:

sh -n scriptname

and you can run your script with each line printing (with variable substitution) as it executes by invoking your script as:

sh -x scriptname

These are excellent debugging tools. If you are still having trouble, post your script with your specific question(s), and I'm sure you'll find people willing to help you.

Hv u seen my script? any suggestion?cheers