Shell Programming and Scripting

I have tried to thoroughly search other threads before posting this question...

I have a shell script (bsh) that I'd like to "re-execute" if the user chooses to. Before the program is executed again the local variables (those set within the script) need to be unset. Is there a command that will list these to make unset easy and thorough? From what I understand env cannot be used to list just local variables.

There may be another way to re-execute rather than using unset and then exec that I haven't thought of. I am open to any suggestions. Thanks.

Variables set within a script cease to exist, or revert to their values before the script was executed, when the script terminates (except, that is, if the script is sourced).

Code:

$ unset A B
$ export A B
$ A=33
$ cat myScript
A=40
echo A is $A
B=60
echo B is $B

$ ./myScript
A is 40
B is 60

$ echo A is $A
A is 33
$ echo B is $B
B is

If you're executing (as opposed to sourcing) the script and it's not explicitly exporting the variables then they won't be set anyway, since they're local to the subshell.

If you are exporting the variables , will get it in env command.
Otherwise start with set but it will list all the variables not just local variables set in the script .
Hope others has better solution.

I had previously been using an until loop to cycle the program back around and that required the unset. I made the wrong assumption exec would require the same. Thanks for the information.

You could always diff the set output from before & after. Of course, you actually have to run the script.

Alternatively if the env command lists exported variables and set lists all variables you diff the output of these commands.

Andrew