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19.3 `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 program accepts the following option.  Also see *note Common

     Output a zero byte (ASCII NUL) at the end of each line, rather
     than a newline. This option enables other programs to parse the
     output of `printenv' even when that output would contain data with
     embedded newlines.

   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