Very Computer

by **Michael Newcom** » Sat, 18 Dec 1999 04:00:00

Hi all,

I'm trying to figure out it the Korn shell allows the programmer to use
calls and returns much like
in C programming?

My problem is I'm working on a delimited database, and I want to create a
shell to perform
additions, deletions, display, and modifications of the data with a menu
that is centered and
prompts the user for a choice, and then allows the various functions to
occur.

Anyone's help would be appreciated.

Regards,
Mike

by **Chris Costell** » Sat, 18 Dec 1999 04:00:00

[message reformatted for readability]

> Hi all,
> I'm trying to figure out it the Korn shell allows the programmer to
> use calls and returns much like in C programming?
> My problem is I'm working on a delimited database, and I want
> to create a shell to perform additions, deletions, display, and
> modifications of the data with a menu that is centered and prompts the
> user for a choice, and then allows the various functions to occur.

I can't help you with designing your menu, only your question
about functions.

Try this:

---
#!/bin/ksh

function myfunc {
if [ -z "$1" ]
then
return 2
fi

if [ "$1" = "OK" ]
then
return 0 # OK
else
return 1 # Not OK
fi

Quote:}

myfunc
echo "Return value for myfunc with no args: $?"
myfunc OK
echo "Return value for 'myfunc OK': $?"
myfunc NOT_OK
echo "Return value for 'myfunc NOT_OK': $?"
---

by **Michael Newcom** » Sat, 18 Dec 1999 04:00:00

Chris,

here is my new problem,

I need the functions to be in the same file as the script.

Example:

menu () {
echo "this is the menu"
read yourselection
case $line in
[Aa]) return 11;;
[Dd]) return 12;;
[Mm]) return 13;;
[Ii}]) return 14;;
[Xx} return 15;;
esac

Quote:}

add () {
echo "this is a test of add"

Quote:}

delete() {
echo "this is a test of delete"

Quote:}

modify () {
echo "this is a test of modify"

Quote:}

inquiry() {
echo "this is a test to inquiry"

Quote:}

exitprgm () {
exit 1

Quote:}

"end of example"

How should the main program look like and what is wrong with the current
scheme?

Any help will be appreciated.

Mike

> [message reformatted for readability]

> > Hi all,

> > I'm trying to figure out it the Korn shell allows the programmer to
> > use calls and returns much like in C programming?

> > My problem is I'm working on a delimited database, and I want
> > to create a shell to perform additions, deletions, display, and
> > modifications of the data with a menu that is centered and prompts the
> > user for a choice, and then allows the various functions to occur.

> I can't help you with designing your menu, only your question
> about functions.

> Try this:

> ---
> #!/bin/ksh

> function myfunc {
> if [ -z "$1" ]
> then
> return 2
> fi

> if [ "$1" = "OK" ]
> then
> return 0 # OK
> else
> return 1 # Not OK
> fi
> }

> myfunc
> echo "Return value for myfunc with no args: $?"
> myfunc OK
> echo "Return value for 'myfunc OK': $?"
> myfunc NOT_OK
> echo "Return value for 'myfunc NOT_OK': $?"
> ---

by **Chris Costell** » Sat, 18 Dec 1999 04:00:00

> How should the main program look like and what is wrong with the current
> scheme?

There's nothing wrong with it and you appear capable of
figuring out how to actually do this on your own. Here's a hint,
though: Use a case statement on the return value of menu.

Very Computer

Calls

Calls

Calls

Calls

Calls