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base64 encode:
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This example is for encoding a username and password (You would replace username and password with the actual username and password):
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echo -n 'username:password' | base64
base64 decode
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This example is decoding the username and password example above. It can be used to decode any base64 encoded text:
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echo 'dXNlcm5hbWU6cGFzc3dvcmQ=' | base64 -D
base64 encode image:
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This example is for encoding an image file and outputting it to text.
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base64 -i picture.png -o picture.txt

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