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Library: GNU bash Command Reference (Darwin 9.0)

caller

caller: caller [EXPR]

Returns the context of the current subroutine call.

Without EXPR, returns "$line $filename".  With EXPR,
returns "$line $subroutine $filename"; this extra information
can be used to provide a stack trace.

The value of EXPR indicates how many call frames to go back before the
current one; the top frame is frame 0.

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