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`printenv': Print all or some environment variables

   `printenv' prints environment variable values.  Synopsis:

     printenv [OPTION] [VARIABLE]...

   If no VARIABLEs are specified, `printenv' prints the value of every
environment variable.  Otherwise, it prints the value of each VARIABLE
that is set, and nothing for those that are not set.

   The only options are a lone `--help' or `--version'.  Note: Common

   Exit status:

     0 if all variables specified were found
     1 if at least one specified variable was not found
     2 if a write error occurred

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