getenv - evaluates if a string is an evironment variable
string getenv -> path true
string getenv -> false
SLI ] (HOME) getenv
SLI [2] pstack
true
(/home/gewaltig)
SLI ] (NONEXISTING) getenv =
false
SLI ] (/home) getenv
false
getenv checks if the string is an environment variable. If
this is the case the path of the variable and true is pushed on the stack,
otherwise a false is pushed on the stack and the string is lost.
if getenv is used with the wrong argument (e.g. integer),
the SLI Session is terminated
docu by Marc Oliver Gewaltig and Sirko Straube
/builddir/build/BUILD/nest-simulator-3.3/nest-simulator-3.3/sli/slistartup.cc