Question

Basically I want to type show and it checks if there is a show command or alias is defined and fire it and it is not defined fires git show.

For example rm should do rm but checkout should do git checkout.

Is it possible to program this in bashrc?

Answer 1

This is surprisingly easy:

master tmp$ trap 'git $BASH_COMMAND' ERR
master tmp$ touch foo
master tmp$ rm foo
master tmp$ add foo
bash: add: command not found
fatal: pathspec 'tmp/foo' did not match any files
master tmp$ branch
bash: branch: command not found
  aix
  allocators
  ...

This runs the usual touch and rm commands, but because there is no add command it runs git add foo and because there is no branch command it runs git branch

The trap command is run on any error, so not only when a command isn’t found. You would probably want to do something smarter e.g. run a script which checks whether $? is 127 (the code bash sets when a command is not found) and then checks if running it with git instead would work (e.g. by checking for a command called git-xxx where xxx is the first word of $BASH_COMMAND). I leave that as an exercise for the reader.