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## Predefined Variables

jed includes some predefined variables which the user may change. By convention, predefined variables are in uppercase. The variables which effect all modes include:

`BLINK`
(1) if non-zero, blink matching parenthesis.

`TAB_DEFAULT`
(8) sets default tab setting for newly created buffers to specified number of columns.

`TAB`
Value of tab setting for current buffer.

`ADD_NEWLINE`
(1) adds newline to end of file if needed when writing it out to the disk.

`META_CHAR`
(-1) prefix for chars with high bit set (see section on eight bit clean issues for details)

`DISPLAY_EIGHT_BIT`
see section on eight bit clean issues.

`COLOR`
(23) IBMPC background color (see `jed.rc` for meaning)

`LINENUMBERS`
(0) if 1, show current line number on status line

`WANT_EOB`
(0) if 1, [EOB] denotes end of buffer.

`TERM_CANNOT_INSERT`
(0) if 1, do not put the terminal in insert mode when writing to the screen.

`IGNORE_BEEP`
(0) do not beep the terminal when signalling errors

In addition to the above, there are variables which affect only certain modes. See the section on modes for details.

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