Dupli Find Portable searches duplicate lines in text files, Excel spreadsheets, and Word documents. Found duplicates are reported and can be easily removed from the file. Custom scripts can be used to narrow down the search for better results. Dupli Find can also be used as a general text utility that provides many functions for manipulating text files. Everything can be automated using command lines to save time and effort.
Limitations:
Save-disabled, 30-day trial
Comments not found