About
Caller is a builtin command that returns the context (localization) of any active subroutine call (a shell function or a script executed with the . or source builtins.
Syntax
caller [expr]
- The current frame is frame 0.
- The return value is 0 unless the shell is not executing a sub- routine call or expr does not correspond to a valid position in the call stack.
Without expr
Without expr, caller displays the line number and source filename of the current subroutine call.
With expr
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.