Hjdcti

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?

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.

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

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

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