Output, Assign, Pipe and Redirect a Heredoc in a Shell Script

You may want to use this when working with multi-line strings or strings with mixed quotes.

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REFERENCE LINKS
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► https://nickjanetakis.com/blog/output...
► https://stackoverflow.com/a/1655389

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THE TOOLS I USE / GEAR
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TIMESTAMPS
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0:00 -- Intro
0:20 -- A run down on heredocs
2:56 -- Avoiding variable or expression interpolation
4:31 -- Assigning a multi-line string to a variable with cat vs read
7:19 -- Piping a heredoc to another command as input
8:20 -- Piping things into kubectl where it expects a file as input
10:04 -- Doing the same as before but with curl
11:14 -- Redirecting a multi-line string to a file