How to set PATH only in bash script temporarily?

Question

PATH can be set temporarily for following commands. Also, PATH can be set in a script, which remains permanently (in that terminal, or session). How can I set PATH that is globally effective in the script but not after the script finishes?

Example:

PATH=$PATH:/path1 path1 is valid only for this line
export PATH=$PATH:/path2
path2 is valid for this line
and this line too
I like it

exit

> path2 is still valid after the script finishes
> and when I type commands here manually
> I don't like it

Answer 1

I think you are looking for "source" command (linux).

First write you set Path command (or whatelse) in file, like this loadMyEnvironment.sh

#!/bin/bash
export PATH="$PATH:test"
export MESSAGE="Now i am available on the current shell"

Now,type in the shell,

> source ./loadMyenvironment.sh

Now, in current shell you can check that your envs are loaded.

> echo $MESSAGE
Now i am available on the current shell

hope this helps.

Answer 2

it's simply not true. If you write a script and change the $PATH variable, the change live only in the script:

vi test.sh

inside the file:

#!/bin/bash

export PATH="$PATH:test"

let's test:

echo $PATH
/usr/lib64/qt-3.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/home/matteo/.local/bin:/home/matteo/bin:./bin:/home/matteo/.local/bin:/home/matteo/bin:./bin

chmod ug+x test
./test 
echo $PATH
/usr/lib64/qt-3.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/home/matteo/.local/bin:/home/matteo/bin:./bin:/home/matteo/.local/bin:/home/matteo/bin:./bin

same output. The change is effective only inside the script!