Sourcing variables from other files using Source command (Bash)

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When a child process is started from a BASH script any evironment variables are lost created or changed in the child are lost. If the process or script is called using the source command (abbreviated to a full-stop) a child process is created and variable changes or additions are not lost.

bg1.sh:

place=Monaco

bg2.sh:

bg1.sh
echo "Place is: $place"
# Outputs "Place is: "   as the variable was set in a different (child) process
. bg1.sh
echo "Place is: $place"
# Outputs "Place is: Monaco" as the variable was set in the same process.

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