We know that we can change bash's environment variables, for example
PATH, using initialize script, for example
.bashrc. Just writing
PATH=<VALUE> and you will get what you want.
But, consider this problem:
We have a bash script named
#!/bin/bash mySite="superUser" export mySite echo "the value of mySite is: $mySite"
Then we declare the variable
mySite, execute the
rc script, and then check the the variable's value:
$ declare -x mySite="super" $ ./rc the value of mySite is: superUser $ echo $mySite super
The value is still
super. can we conclude that child shell cannot change parent shell's variable directly using the instruction like
rc script is just like
.bashrc, and how can we change the bash's environment variable's value by placing the
PATH=<VLAUE> in it, for when
.bashrc's execution is over, the variable of the calling shell is still not changed?