Using the Debugger

• Open a DOS window (on Win32) or a shell window (on Unix).

• Type these commands and explain what they do:

  perl -d -e0
  $d = 5;
  $ref = \$d;
  print $$ref;

• Here's a handy quick-reference.

  Perl Debugger Commands

  p x l s n c b d D f print ref	print extended print (display data structure) list (can do range) step next continue break delete break point delete all break points switch back to file print display data type

• To enter multiline commands, end each line with a backslash, e.g.:

  DB<1> foreach (1..3) { \
  cont: print "$_\n"; \
  cont: }

• Suggestion: leave the debugger running in a text window.

• Pop the window to the top and test code fragments as you develop your programs.

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Updated Wednesday, 31-Oct-2001 14:22:37 CST

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