Dedupe Log Lines and Survey Export Rows
When this applies
Turn to this pattern when copy-paste from spreadsheets or repeated API polling creates duplicate rows. Deduplication clarifies incident timelines and prevents BI tools from double-counting revenue events you already reconciled.
Tool to use
Remove duplicate lines from text.
Open Remove Duplicate Lines →Steps
- 1Sort mentally whether order must survive—some pipelines need stable first hits only.
- 2Paste and remove duplicates, then spot-check a known repeated header survived or not.
- 3Reconcile counts against SQL DISTINCT if finance depends on the output.
- 4Version the cleaned file name so raw exports remain restorable.
Examples
- Customer list CSV from a bad join needs unique emails before CRM import.
- Debug logs contain identical heartbeat lines obscuring rare errors.
What to avoid
- Deduping case-sensitively when mail systems treat email case-insensitively.
- Collapsing lines that differ only by invisible timestamps.
- Deleting duplicates before understanding why upstream emitted them twice.
Related tools
On the blog
More in Text Tools
- Count Words and Characters for Drafts and Limits
- Measure Character Limits for Forms and SMS-Style Messages
- Count Line Breaks for Logs, Config, and Poetry Layout
- Sort Lines for Lists, Config Keys, and Playlists
- Reverse Line Order for Stack Parsing and Storyboards
- Strip Blank Lines Before Publishing or Importing Markdown
Browse all task guides or see the full list on the Text Tools hub.
FAQ
Trim whitespace first?
Often yes—run trim or cleaner so `foo` and `foo ` merge intentionally.
Stable uniqueness keys?
For composite keys, concat fields before dedupe instead of line-only tricks.