What is the purpose of export command in Linux bash shell?

Linux
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1

Hi All,
Initially thanks for joining me in this forum.
My question here is, What is the pupose of using export command in linux,?

2

By default all user defined variables are local. They are not exported to new processes. Use export command to export variables and functions to child processes. For example define a variable called foo with value bar:

foo="bar"
echo "$foo"

Now start a new bash shell:

bash

Try to print value of foo:

echo "$foo"

You won’t see any output as the variable $foo is not exported to new bash shell or any other process. To make variable know to child processes and other sessions, use the export command:

export foo="bar"
echo "$foo"
bash
echo "$foo"

For more info see:

  1. Export Variables