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Stops expanding, but without any error message. The version with the name in the middle eventually

The tail recursive version runs infinitely until the editor is nvi 1.79īoth versions exceed an internal expansion limit, theĮxpansion stops, and nvi produces an error message. With the name in the middle of the expansion only expands once. The tail recursive version is not allowed, while the version When tested, we obtained the following results Until a memory error occurred and vi quit. The abbreviation expanded repeatedly, like this: the the the the the. You may or may not produce an infinite loop, but in either caseįor example, when the above command was tested on a System V version If you issue the command: :ab PG the PG rating system The message means that you have tried to define something that willĮxpand itself repeatedly, creating an infinite loop. You'll get the message "No tail recursion," The characters that compose your abbreviationĬannot also appear at the end of your phrase.įor example, if you issue the command: :ab PG This movie is rated PG To list your currently defined abbreviations, type: :ab Where you don't want it to, you can disable the abbreviation by If you create an abbreviation that ends up expanding in places When you are choosing abbreviations, choose combinations ofĬharacters that don't ordinarily occur while you are typing text. (e.g., punctuation), a space, a carriage return, or

KeystrokesĪbbreviations expand as soon as you press a non-alphanumeric character Now whenever you type imrc in insert mode, :ab imrc International Materials Research CenterĪbbreviates International Materials Research Center

Suppose in the file practice you want to enter text thatĬontains a frequently recurring phrase such as a difficult product The sequence of characters that make up the abbreviation will beĮxpanded in insert mode only if you type it as a full word To define an abbreviation, use the ex command:Ībbr is an abbreviation for the specified You can define abbreviations that vi will automaticallyĮxpand into the full text whenever you type the abbreviation in insert mode.