What is the "caller" command? I'm running Ubuntu 10.10 with openbox running on top. I noticed today a command called `caller`, however there is no man page, it does not respond to any input (or --help) and whereis doesn't find it. Any idea what it is?

Run


type caller


and you will see it is a shell built-in. Running


help caller


will show its function, reported as well in bash's manual page. Briefly

> `Return the context of the current subroutine call.`