Yhyjyk

I am trying to setup a bunch of development projects in my Mac. I have to run various tools like python, ruby, scala, groovy etc.
To see if a tool is available I use options like

ruby --version. 

Instead I would like to see all the list of tools available in Mac terminal via a single command.

Are there commands for listing some or all shell programs?

See the answers from this U&L Q&A titled:
List all commands that a shell knows
.

My personal favorite is to utilize compgen since this is part of the family of tools used to build all the tab completion when you're in a terminal and hit tab> + tab twice.

$ compgen -c

Example

$ compgen -c | tail
deepcopy-gen
kube-controller-manager
informer-gen
lister-gen
etcd
gen-apidocs
kube-apiserver
kubectl
kubebuilder
conversion-gen

Incidentally, if you want to know where one of these executables lives on your HDD use type -a <cmd> to find it:

$ type -a ansible
ansible is aliased to `ANSIBLE_CONFIG=~/.ansible.cfg ansible'
ansible is /usr/local/bin/ansible

This shows that the command ansible is an alias and also lives locally on the HDD here: /usr/local/bin/ansible.

References

• 8.7 Programmable Completion Builtins

The easiest is simply to open the Terminal and then press the TAB key twice. You'll be asked if you want to see all possibilities - reply "y" and you'll get the full list.

You could take the PATH variable and translate the colons into spaces then list the files in those directories.

ls $(tr ':' ' ' <<<"$PATH")