Parsing variables from config file in Bash

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Since your config file is a valid shell script, you can source it into your current shell:

. config_file
echo "Content of VARIABLE1 is $VARIABLE1"
echo "Content of VARIABLE2 is $VARIABLE2"
echo "Content of VARIABLE3 is $VARIABLE3"

Slightly DRYer, but trickier

. config_file
for var in VARIABLE1 VARIABLE2 VARIABLE3; do
    echo "Content of $var is ${!var}"
done

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