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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
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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.