OpenBoot 3.x Command Reference Manual

Editing the Contents of the Script

The script editor, nvedit, lets you create and modify the script using the commands listed in Table 3-5.

Table 3-5 Commands Affecting NVRAMAC


Command	Description
`nvalias` `alias device-path`	Stores the command "devalias `alias` `device-path"` in the script. The alias persists until either `nvunalias` or `set-defaults` is executed.
`$nvalias`	Performs the same function as `nvalias` except that it takes its arguments, `name-string` and `device-string`, from the stack.
`nvedit`	Enters the script editor. If data remains in the temporary buffer from a previous `nvedit` session, resumes editing those previous contents. If not, reads the contents of `nvramrc` into the temporary buffer and begins editing it.
`nvquit`	Discards the contents of the temporary buffer, without writing it to `nvramrc`. Prompts for confirmation.
`nvrecover`	Recovers the contents of `nvramrc` if they have been lost as a result of the execution of `set-defaults`; then enters the editor as with `nvedit`. `nvrecover` fails if `nvedit` is executed between the time that the `nvramrc` contents were lost and the time that `nvrecover` is executed.
`nvrun`	Executes the contents of the temporary buffer.
`nvstore`	Copies the contents of the temporary buffer to `nvramrc`; discards the contents of the temporary buffer.
`nvunalias` `alias`	Deletes the specified alias from `nvramrc`.
`$nvunalias`	Performs the same function as `nvunalias` except that it takes its argument, `name-string`, from the stack.

The editing commands shown in Table 3-6 are used in the script editor.

Table 3-6 Script Editor Keystroke Commands


Keystroke	Description
Control-B	Moves backward one character.
Escape B	Moves backward one word.
Control-F	Moves forward one character.
Escape F	Moves forward one word.
Control-A	Moves backward to beginning of the line.
Control-E	Moves forward to end of the line.
Control-N	Moves to the next line of the script editing buffer.
Control-P	Moves to the previous line of the script editing buffer.
Return (Enter)	Inserts a new line at the cursor position and advances to the next line.
Control-O	Inserts a newline at the cursor position and stays on the current line.
Control-K	Erases from the cursor position to the end of the line, storing the erased characters in a save buffer. If at the end of a line, joins the next line to the current line (i.e. deletes the newline).
Delete	Erases the previous character.
Backspace	Erases the previous character.
Control-H	Erases the previous character.
Escape H	Erases from beginning of word to just before the cursor, storing erased characters in a save buffer.
Control-W	Erases from beginning of word to just before the cursor, storing erased characters in a save buffer.
Control-D	Erases the next character.
Escape D	Erases from the cursor to the end of the word, storing the erased characters in a save buffer.
Control-U	Erases the entire line, storing the erased characters in a save buffer.
Control-Y	Inserts the contents of the save buffer before the cursor.
Control-Q	Quotes the next character (i.e. allows you to insert control characters).
Control-R	Retypes the line.
Control-L	Displays the entire contents of the editing buffer.
Control-C	Exits the script editor, returning to the OpenBoot command interpreter. The temporary buffer is preserved, but is not written back to the script. (Use `nvstore` afterwards to write it back.)