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Perl in a Nutshell

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Debugging
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a

a [line] command

Sets an action to be done before the line is executed. The following steps are taken:

For example, the following prints the value of $foo (and "DB FOUND") every time line 53 is passed:

a 53 print "DB FOUND $foo\n"


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6.2 Debugger CommandsBook IndexReference: A