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

  • Checks for a breakpoint at this line.

  • Prints the line if necessary.

  • Performs any actions associated with the line.

  • Prompts the user if at a breakpoint or in single-step mode.

  • Evaluates the line.

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"