$ opam config list

<><> Global opam variables ><><><><><><><><><><><><><><><><><><><><><><><><><><>
arch              x86_64               # Inferred from system
jobs              1                    # The number of parallel jobs set up in
                                         opam configuration
make              make                 # The 'make' command to use
opam-version      2.0.0                # The currently running opam version
os                linux                # Inferred from system
os-distribution   rhel                 # Inferred from system
os-family         scientific           # Inferred from system
os-version        7.5                  # Inferred from system
root              /home/tgphelps/.opam # The current opam root directory
switch            default              # The identifier of the current switch
sys-ocaml-version 4.07.1               # OCaml version present on your system
                                         independently of opam, if any

<><> Configuration variables from the current switch ><><><><><><><><><><><><><>
prefix   /home/tgphelps/.opam/default
lib      /home/tgphelps/.opam/default/lib
bin      /home/tgphelps/.opam/default/bin
sbin     /home/tgphelps/.opam/default/sbin
share    /home/tgphelps/.opam/default/share
doc      /home/tgphelps/.opam/default/doc
etc      /home/tgphelps/.opam/default/etc
man      /home/tgphelps/.opam/default/man
toplevel /home/tgphelps/.opam/default/lib/toplevel
stublibs /home/tgphelps/.opam/default/lib/stublibs
user     tgphelps
group    tgphelps