export variable if the child shell wanted to inherit the environment variables of parent shell
2013-04-01 17:33
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case 1:
a=10
echo $a ;// yield to 10
bash // create one child shell
echo $a; // yield to nothing
case 2:
export a=10
echo $a // yield to 10
bash // create one child shell
echo $a // yield to 10
a=10
echo $a ;// yield to 10
bash // create one child shell
echo $a; // yield to nothing
case 2:
export a=10
echo $a // yield to 10
bash // create one child shell
echo $a // yield to 10
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