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Perl in a Nutshell, 2nd Edition
book

Perl in a Nutshell, 2nd Edition

by Nathan Patwardhan, Ellen Siever, Stephen Spainhour
June 2002
Beginner content levelBeginner
759 pages
80h 42m
English
O'Reilly Media, Inc.
Content preview from Perl in a Nutshell, 2nd Edition

Name

a

Synopsis

a [line] command
                  

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"
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Publisher Resources

ISBN: 0596002416Errata Page