topic Re: invoking a function with parameter in Operating System - Linux

invoking a function with parameter

Maciej Szewczykowski — Wed, 15 Oct 2003 03:46:40 GMT

hi all.
how to invoke a function so it takes certain values as parameters?
the point is: i've got a function that work with two variables (v1, v2). i'd like to make it work each time with different values of these variables. where should the function take values from (command line? file?)
how to make it work?

Re: invoking a function with parameter

Mark Grant — Wed, 15 Oct 2003 03:49:47 GMT

Lets assume you mean a shell script for the moment. When you call the function, just use your values as arguments and within the function reference them as $1 $2 etc etc.

Hope this helps.

Re: invoking a function with parameter

Maciej Szewczykowski — Wed, 15 Oct 2003 03:53:42 GMT

Mark, could you please write a short example? (i mean how to send values to the function)

Re: invoking a function with parameter

Mark Grant — Wed, 15 Oct 2003 03:59:28 GMT

function myecho {
echo $1
}

myecho hello
exit

I don't know if you can prototype functions so its safer to just declare the functions first.

Re: invoking a function with parameter

Jerome Henry — Wed, 15 Oct 2003 04:00:38 GMT

Write :
v1=3
v2=7
echo $v1
3
echo $v2
7

hth

J

Re: invoking a function with parameter

Maciej Szewczykowski — Wed, 15 Oct 2003 04:02:46 GMT

quick question - quick answer. thanks a lot guys.

Re: invoking a function with parameter

Graham Cameron_1 — Wed, 15 Oct 2003 04:04:44 GMT

Didn't you ask this yesterday in the HP forums ??
http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=233360
--
Anyway, within the function, just refer to $1, $2 as your parameters, and call it using syntax "yourfunc p1, p2".
Example: function leave takes an optional single parameter
--
function leave {
[ -n "$1" ] && exit_cd=$1
exit $exit_cd
}
-- and can be called in 2 ways --
leave 1
leave
--
--Graham

Re: invoking a function with parameter

Mark Grant — Wed, 15 Oct 2003 04:10:04 GMT

And another, just to show some looping

function addten {
b=`expr $1 + 10`
echo "$1 plus 10 is $b"
}

for i in 10 23 4 65
do
addten $i
done

Re: invoking a function with parameter

Maciej Szewczykowski — Wed, 15 Oct 2003 04:20:52 GMT

that's right. thank you once more.