FORMS wrapped by handlers and last ditch try/catch for standard exceptions.
For conditions, the condition info meta data map is returned. For exceptions,
the exception is converted to a string representation and that is returned.

Obtain and return cpu utilization.  Requires the 'top' command is
available, and takes the second of two samplings (first samples
from top are typically inaccurate).  INFO indicates the type of
information returned:

:idle, just the avg % idle, this is the default
:used, just the avg % used
:both, both idle and used

In  all cases  uses  aggregate cpu  utilization  over SMP  systems.
Values are returned as Doubles,  or for :both, a two element vector
of Doubles [idle used].

def with auto declaration of symbol SYM to be dynamic

Generates a unique keyword id whose name is the str of gen-uid

Generates a unique integer ID based on universal time.

Return the value of the environment variable EV (a string).
Optionally, (no argument variant) return a map of all the
environment variables.

Hide some try+ details.  Form is the expression that is exception
protected.  Cases are handler arms of the form [c e & body].  Where
c is the predicate for the case arm (with out preceding 'catch'), e
is the variable (symbol) to hold the exception object and body is
the set of forms to execute.  Within body, the captured symbol
contextMap is holds the exception context map.

Obtain the host IP addresses (:inet4 and :inet6) for the machine on
which we are running. Returns a map of interfaces filtered for
being up, non virtual, and not the loopback, and their associated
vector of inet6 and inet4 addresses. For example:

{:eth0 {:inet6 ["fe80:0:0:0:225:90ff:fe21:66d2%2"],
        :inet4 ["136.167.54.82"]}}

Wraps throw+ for throwing a map object.  Ensures that (count args)
is even, then places pairs into a map which is given to throw+

RUNs an eXternal program PROGRAM (a string naming the program executable),
passing it the (typically, _command line_) arguments ARGS.  ARGS is either
a single vector or list of the arguments, or a sequential list of the
arguments given to the function as further arguments after the program.

Return the process id of the running JVM.  Uses ManagementFactory
getRuntimeMXBean, which has a getName method.  The getName method
will _likely_ return name as: <pid>@<host-name>, as a string.  This
method then pulls off the pid from this and returns it as a string.

Time the application of F (a function) to ARGS (any set of args as
expected by f.  Returns a two element vector [ret time] where,

ret is the return value of f

time is the time f took to compute ret in milliseconds

FORMS wrapped by handlers and last ditch try/catch for standard exceptions.
For conditions, the condition info meta data map is returned. For exceptions,
the exception is converted to a string representation and that is returned.

Wraps FORM in a slingshot try+ with catch arms for each condition
in CONDITIONS. Each handle arm catches the condition C and prints a
stack trace for it.  Hence, while this catches the conditions, it
stops execution.  For catch and continue see CATCH-ALL