TextEdit has a dialog that lets you select lines. You can invoke the Select Line window by pressing Command-L. In this window, you can enter a single line number, but you can also enter relative selections or ranges. For example, enter the following:
2: selects line 2.
+2: selects the second line after the line where the cursor is.
-2: selects the second line before the line where the cursor is.
12-14: selects lines 12, 13 and 14.
+2-4: selects 3 lines, 2 lines after the line where the cursor is.
-2-4: selects 3 lines, 2 lines before the line where the cursor is
2: selects line 2.
+2: selects the second line after the line where the cursor is.
-2: selects the second line before the line where the cursor is.
12-14: selects lines 12, 13 and 14.
+2-4: selects 3 lines, 2 lines after the line where the cursor is.
-2-4: selects 3 lines, 2 lines before the line where the cursor is
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