i want to update the variable a become 2. But the result is always 1. Is there anyway to do it?
a=1
aple(){
a=2
echo "apel"
}
b=`aple`
echo $a
Problem is in this call:
b=`aple`
Which invokes aple function in a subshell hence changes made in subshell are lost and not visible in the parent shell.
Call your function as:
aple
echo $a
2
As per your comments if you want to assign a value to b also then have your function as:
a=1
b=
aple() { a=2; b="apel"; }
Then call it as:
aple
echo "$b:$a"
apel:2
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