perl -d -e "print aaa" perl -d -e "print aaa" Loading DB routines from version 1.3 Editor support available. Enter h or `h h' for help, or `man perldebug' for more help. main::(-e:1): print aaa # Help DB<1> h # Next DB<1> n # Print DB<1> p $var Debugged program terminated. Use q to quit or R to restart, use o inhibit_exit to avoid stopping after program termination, h q, h R or h o to get additional info. DB<1> q
List/search source lines: Control script execution: l [ln|sub] List source code T Stack trace - or . List previous/current line s [expr] Single step [in expr] v [line] View around line n [expr] Next, steps over subs f filename View source in file <CR/Enter> Repeat last n or s /pattern/ ?patt? Search forw/backw r Return from subroutine M Show module versions c [ln|sub] Continue until position Debugger controls: L List break/watch/actions o [...] Set debugger options t [expr] Toggle trace [trace expr] <[<]|{[{]|>[>] [cmd] Do pre/post-prompt b [ln|event|sub] [cnd] Set breakpoint ! [N|pat] Redo a previous command B ln|* Delete a/all breakpoints H [-num] Display last num commands a [ln] cmd Do cmd before line = [a val] Define/list an alias A ln|* Delete a/all actions h [db_cmd] Get help on command w expr Add a watch expression h h Complete help page W expr|* Delete a/all watch exprs |[|]db_cmd Send output to pager ![!] syscmd Run cmd in a subprocess q or ^D Quit R Attempt a restart Data Examination: expr Execute perl code, also see: s,n,t expr x|m expr Evals expr in list context, dumps the result or lists methods. p expr Print expression (uses script's current package). S [[!]pat] List subroutine names [not] matching pattern V [Pk [Vars]] List Variables in Package. Vars can be ~pattern or !pattern. X [Vars] Same as "V current_package [Vars]". i class inheritance tree. y [n [Vars]] List lexicals in higher scope <n>. Vars same as V. e Display thread id E Display all thread ids. For more help, type h cmd_letter, or run man perldebug for all docs.


Global 変数はさける 同一名の Symbol があると 関数呼び出しだけで 値が変更されるかも


BUG を早期に発見する