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Let's say I have a script:

echo $1
if [[ ! $1 ]];then
echo "True"
export ABC="/home/aashish"

ABC is not available after the execution of this script. How can I make that variable persist after the execution as well?

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No way. Have you read What scopes can shell variables have?? – manatwork Jul 3 '12 at 12:17
possible duplicate of How can I make variables "exported" in a bash script stick around? – Gilles Jul 3 '12 at 22:43
up vote 4 down vote accepted

source it into current shell session.

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