Re: Exit status or function return value?
- From: Barry Margolin <barmar@xxxxxxxxxxxx>
- Date: Sat, 21 Apr 2007 21:47:24 -0400
In article <1177205275.078235.198930@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
heylow <vnr1995@xxxxxxxxx> wrote:
I ran this piece of script. I got the out put as follows:
$ ./pass1
5 + 10 = 15
10 - 2 = 8
10 / 2 = 5
5
My naive question: why $? returns 5, instead of the exit status of the
function calc, which must be 0. I know my assumption is wrong. But I
would like to know why it returns the way it did.
The "return $ans" command sets the function's exit status to $ans.
Thank you.
$cat pass1
#!/bin/sh
function cal()
{
n1=$1
op=$2
n2=$3
ans=0
if [ $# -eq 3 ]; then
ans=$(( $n1 $op $n2 ))
echo "$n1 $op $n2 = $ans"
return $ans
else
echo "Function cal requires atleast three args"
fi
return
}
cal 5 + 10
cal 10 - 2
cal 10 / 2
echo $?
--
Barry Margolin, barmar@xxxxxxxxxxxx
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
*** PLEASE don't copy me on replies, I'll read them in the group ***
.
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