}
fun3 $1 $2 $3
echo "the result is $result"
if [ `echo "$temp > $value" | bc -ql` -ne 0 ]
then
echo "temp is larger"
else
echo "temp is still smaller"
fi
[~/shell/function]# ./variable.sh 12 3 2
temp is: 5
value is: 6
the result is 72
temp is larger
在这种情况下，在函数内部最好使用局部变量，消除影响。
[~/shell/function]# cat ./variable.sh
#!/bin/bash
if [ $# -ne 3 ]
then
echo "usage: $0 a b c"
exit
fi
temp=5
value=6
echo temp is: $temp
echo value is: $value
fun3() {
local temp=`echo "scale=3;$1*$2*$3" | bc -ql`
result=$temp
}
fun3 $1 $2 $3
echo "the result is $result"
if [ `echo "$temp > $value" | bc -ql` -ne 0 ]
then
echo "temp is larger"
else
echo "temp is still smaller"
fi
[~/shell/function]# ./variable.sh 12 3 2
temp is: 5
value is: 6
the result is 72
temp is still smaller
6.向函数传递数组变量：
[~/shell/function]# cat array.sh
#!/bin/bash
a=(11 12 13 14 15)
echo ${a[*]}
function array(){
echo parameters : "$@"
local factorial=1
for value in "$@"
do
factorial=$[ $factorial * $value ]
done
echo $factorial
}
array ${a[*]}
[~/shell/function]# ./array.sh
11 12 13 14 15
parameters : 11 12 13 14 15
360360
7.函数返回数组变量
[~/shell/function]# cat array1.sh
#!/bin/bash
a=(11 12 13 14 15)
function array(){
echo parameters : "$@"
local newarray=(`echo "$@"`)
local element="$#"
local i
for (( i = 0; i < $element; i++ ))
{
newarray[$i]=$[ ${newarray[$i]} * 2 ]
}
echo new value:${newarray[*]}
}
result=`array ${a[*]}`
echo ${result[*]}
[~/shell/function]# ./array1.sh
parameters : 11 12 13 14 15 new value:22 24 26 28 30
