Devel::LineTrace - Apply traces to individual lines.
perl -d:LineTrace myscript.pl [args ...]
This is a class that enables assigning Perl code callbacks to certain lines in the original code without modifying it.
To do so prepare a file with the following syntax:
[source_filename]:[line] [CODE] [CODE] [CODE] [source_filename]:[line] [CODE] [CODE] [CODE]
Which will assign the [CODE] blocks to the filename and line combinations. The [CODE] sections are indented from the main blocks. To temporarily cancel a callback put a pound-sign (#) right at the start of the line (without whitespace beforehand).
The location of the file should be specified by the PERL5DB_LT environment variable (or else it defaults to
Then invoke the perl interpreter like this:
perl -d:LineTrace myprogram.pl
Copyright 2011 by Shlomi Fish.
This program is distributed under the MIT (X11) License: http://www.opensource.org/licenses/mit-license.php
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Shlomi Fish ( http://www.shlomifish.org/ ).