linux - How to extract a variable assignment from within a string -

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i trying extract variable assignment file defined within larger string in external file /home/user/file.txt:

export os_username=xxxxx

i want "source" file , pull variable assignment script treats as:

os_username=xxxxx

i pipe variable command running on script.

config -- "$os_username" --test --run

can explain me how can pull variable assignment external file?

in script

#! /bin/bash  source /path/to/file.txt # variables set command command ...

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