Following is a description of the Text Patch commands, in addition to the common commands. Most of these commands are available as toolbar buttons.
Pick Tools > Options 
and switch to the Toolbars, etc. page to define your own keyboard shortcuts, and hide or expose commands on the menus and toolbars.
The File menu
Open With |
Opens the file in one of the external Open With applications. |
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Open With > Associated Application |
Opens the file with its associated application. |
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Open With > Text Edit |
Opens the file with the built-in text editor. |
Apply Patch |
Applies the patch file. |
The Edit menu
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Copy |
Copies selection to the Clipboard. |
Select All |
Selects all visible lines in the current pane. |
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Select Section |
Selects all lines in the current section. |
The Search menu
Next Difference |
Positions at next difference text. |
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Previous Difference |
Positions at previous difference text. |
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Next Difference Section |
Positions at next difference section. |
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Previous Difference Section |
Positions at previous difference section. |
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Next Difference Files |
Opens the next pair of files with differences. |
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Previous Difference Files |
Opens the previous pair of files with differences. |
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Find |
Searches for matching text. |
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Find Next |
Finds next occurrence of search string. |
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Find Previous |
Finds previous occurrence of search string. |
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Go To |
Positions at specified line and column. |
Toggle Bookmark |
Places a numbered marker on the current line of the comparison, numbered from 0 to 9. |
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Go To Bookmark |
Repositions at the specified bookmark. |
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Clear Bookmarks |
Removes all bookmarks from the comparison. |
The View menu
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Visible Whitespace |
Shows or hides visible spaces, tabs. |
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Line Numbers |
Shows or hides line numbers. |
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Syntax Highlighting |
Shows or hides syntax highlighting. |
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Display Font * |
Selects the font to use in editor panes. |
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Increase Display Font Size * |
Increases editor font size. |
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Decrease Display Font Size * |
Decreases editor font size. |
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Reset Display Font Size * |
Resets editor font size. |
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Side-by-side Layout |
Arranges editor panes left and right of each other. |
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Over-under Layout |
Arranges editor panes above and below each other. |
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Thumbnail |
Shows or hides the thumbnail summary of changes at left of view. |
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Text Details |
Shows or hides the text details panel at bottom of view. |
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Hex Details |
Shows or hides the hexadecimal details panel at bottom of view. |
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Alignment Details |
Shows or hides the alignment details panel at bottom of view. |
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Ruler |
Shows or hides the line details ruler. |
Toolbar |
Shows or hides the toolbar. |
* Hidden by default.