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Whenever you read a read-only file into a buffer using
find-file or visit-file, Epsilon makes the buffer
read-only, and indicates this by displaying "RO" in the modeline.
Epsilon keeps you from modifying a read-only buffer. Attempts to do
so result in an error message. In a read-only buffer you can use the
<Space> and <Backspace> keys to page forward and back more
conveniently; see the readonly-pages variable to disable this.
If you want to modify the buffer, you can change its read-only status
with the change-read-only command on Ctrl-x Ctrl-q. With no
numeric argument, it toggles the read-only
status. With a non-zero numeric argument, it makes the buffer
read-only; with a numeric argument of zero, it makes the buffer
The change-read-only command sets the buffer's status but
doesn't change the read-only status of its file. Use the
change-file-read-only command to toggle whether or not
a file is read-only.
By default, when Epsilon reads a read-only file, it displays a
message and makes the buffer read-only. To make Epsilon do something
else instead, you can set the readonly-warning variable,
default 3, according to the table.
| ||Action ||0 ||1 ||2 ||3 ||4 ||5 ||6 ||7|
| ||Display a warning message ||N ||Y ||N ||Y ||N ||Y ||N ||Y|
| ||Make buffer read-only ||N ||N ||Y ||Y ||N ||N ||Y ||Y|
| ||Ring the bell ||N ||N ||N ||N ||Y ||Y ||Y ||Y|
Sometimes you may want to edit a file that is not read-only, but
still have Epsilon keep you from making any accidental changes to the
file. The find-read-only-file command does this. It prompts
for a file name just like find-file and reads it, but marks
the buffer read-only so it cannot be modified, and sets it so that if
you should ever try to save the file, Epsilon will prompt for a
Epsilon Programmer's Editor 14.00 manual. Copyright (C) 1984, 2020 by Lugaru Software Ltd. All rights reserved.