Highlight duplicated lines. This is a Sublime Text 3 (and ST2) plugin.
Press ctrl+shift+p (cmd+shift+p for OSX), then use the 'Package Control: Install Package' command.
Search for 'HighlightDuplicates', and press enter to install.
Using this command will turn the plugin on and off. This allows you to see the highlighted only when you want without having to disable/enable to plugin via the Package Control.
Using this command will select the rows that would be highlighted when Highlight Duplicates is toggled on. The duplicate rows do not need to be highlighted in order for this command to work.
If you'd like to use a custom color, it should be defined as a color scope in your theme file.
If this setting is true, the leading and trailing white space will be removed before being compared to other lines. This setting also affects which lines are selected when using the 'Select Duplicates' command.
For example, if "trim_white_space" : true the following 2 lines will be counted as duplicates.
However, the following lines would not be counted as duplicates. The reason for this is because there is white space in line 1 that is not leading or trailing, which does not appear in line 2.
If this setting is true, upper and lower case letters will be considered the same. This setting also affects which lines are selected when using the 'Select Duplicates' command.
For example, if "ignore_case" : true the following 2 lines will be counted as duplicates.