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From a Bash shell, which of the following commands directly execute the instructions from the file /usr/local/bin/runme.sh without starting a subshell? (Choose two.)
Create a script that outputs the shell level environmental variable using "echo $SHLVL". When you execute this script using source or dot (.) it will display 1 showing that the script was executed in the current shell. When you execute the script using full path it will show 2, showing that the script was executed in a subshell.
When a script is run using source it runs within the existing shell, any variables created or modified by the script will remain available after the script completes.
source is a synonym for dot/period '.' in bash.
Be careful!
./ and source are not quite the same.
./script runs the script as an executable file, launching a new shell to run it
https://ss64.com/bash/source.html
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