s6-portable-utils
Software
skarnet.org
 The s6-printenv program 
 s6-printenv prints its environment variables.
 Interface 
     s6-printenv [ -n ] [ -0 | -d delim ]
 s6-printenv prints its environment on stdout, like
s6-env.
 Options 
 -  -0 : separate variable definitions with a null character
instead of a newline. 
-  -d delim : separate variable definitions with the
first character of delim instead of a newline 
-  -n : omit the last delimiter character