O

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

• Sets or queries option values. If omitted, val defaults to . 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.