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printenv: add page (#2400)

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Chris 2018-10-09 00:16:27 +02:00 • committed by Starbeamrainbowlabs
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# printenv
> Print values of all or specific environment variables.
- Display key-value pairs of all environment variables:
`printenv`
- Display the value of a specific variable:
`printenv {{HOME}}`
- Display the value of a variable and end with NUL instead of newline:
`printenv --null {{HOME}}`