O

O [opt[="val"]] [opt`val'] [opt?]

• Sets or queries option values. If omitted, val defaults to 1. opt? displays the value of option opt. opt can be abbreviated to the shortest unique string, and multiple options can be specified. The possible options are:
  • AutoTrace
  • Affects printing of messages at every possible breaking point.
  • frame
  • Enables printing of messages on entry and exit from subroutines.
  • inhibit_exit
  • Enables stepping off the end of the script.
  • maxTraceLen
  • Gives the maximum length of evals/args listed in the stack trace.
  • ornaments
  • Affects the appearance of the command line on the screen.
  • pager
  • Specifies the program to use for output of pager-piped commands (those beginning with a | character). Default value is $ENV{PAGER}.
  • PrintRet
  • Enables printing of return value after r command.
  • recallCommand, ShellBang
  • Specifies the characters used to recall previous commands or spawn a shell. By default, these are both set to !.

  The following options affect what happens with the V, X, and x commands:

  • arrayDepth, hashDepth
  • Prints only to depth n ("" for all).
  • compactDump, veryCompact
  • Changes style of array and hash dumps.
  • DumpDBFiles
  • Dumps arrays holding debugged files.
  • DumpPackages
  • Dumps symbol tables of packages.
  • globPrint
  • Specifies whether to print contents of globs.
  • quote, HighBit, undefPrint
  • Changes style of string dump.
  • signalLevel, warnLevel, dieLevel
  • Specifies level of verbosity.
  • tkRunning
  • Runs Tk while prompting (with ReadLine).

  During startup, debugger options are initialized from $ENV{PERLDB_OPTS}. You can set the additional initialization options TTY, noTTY, ReadLine, and NonStop there. See "Customizing the Debugger," later in this chapter, for more information.