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This is an app for the Linux command grep (searches for and displays a specified string in all text files within a specified folder).
* Tapping a search result displays the file's Viewer screen.
(Lines containing the search string are displayed in red.)
* Tapping the Viewer screen copies the tapped line to the clipboard.
* Double-tapping the Viewer screen displays the Editor screen.
(Open/Save/Search commands can be executed in the Editor.)
* Long-pressing the Viewer screen allows you to select the app to open the file with.