caller
NAME
caller - Returns the context of any active subroutine call (a shell function or a script executed with theSYNOPSIS
caller [expr]
DESCRIPTION
Returns the context of any active subroutine call (a shell function or a script executed with the . or source builtins). Without expr, caller displays the line number and source filename of the current subroutine call. If a non-negative integer is supplied as expr, caller displays the line number, subroutine name, and source file corresponding to that position in the current execution call stack. This extra information may be used, for example, to print a stack trace. The current frame is frame 0. The return value is 0 unless the shell is not executing a subroutine call or expr does not correspond to a valid position in the call stack.
SEE ALSO
This is extracted from the main bash man page, see there for more details.