How do I uncomment a region in Emacs?
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- First, select the region.
- To comment, use. ALT + x comment-region.
- To un-comment, use. ALT + x uncomment-region.
How do I comment in Emacs?
The command that creates a comment is M-; ( indent-for-comment ). If there is no comment already on the line, a new comment is created, aligned at a specific column called the comment column. The comment is created by inserting the string Emacs thinks comments should start with (the value of comment-start ; see below).
How do I redo in Emacs?
in plain emacs, to redo, just press Ctrl + g first then undo. Further undo will be redo. Press Ctrl + g again to reverse direction.
How do you comment on a lisp?
2.3 Comments In Lisp, an unescaped semicolon (‘ ; ‘) starts a comment if it is not within a string or character constant. The comment continues to the end of line. The Lisp reader discards comments; they do not become part of the Lisp objects which represent the program within the Lisp system.
How do I undo changes in Emacs?
The command C-x u or C-_ is how you undo. The first time you give this command, it undoes the last change.
How do you undo and redo in Emacs?
How do I comment multiple lines in Emacs?
Emacs also allows you to pass the number of lines you need to comment or uncomment. To do this: Start by pressing the CTRL + U key, followed by the number of lines to comment out. As you can see from the screenshot above, Emacs comments out 10 lines from the current cursor position.
What is Cond Lisp?
COND. COND is an unusual function which may take any arbitrary number of arguments. Each argument is called a clause, and consists of a list of exactly two S-expressions. We will call the first S-expression in a clause a condition, and the second S-expression a result.
What is the command to quit Emacs in Emacs?
C-x C-c
When you want to leave Emacs for a short time, type a C-z and Emacs will be suspended. To get back into Emacs, type %emacs at the shell prompt. To quit Emacs permanently, type C-x C-c.
What is the command to undo Emacs?
The command C-x u or C-_ allows you to undo changes. The first time you give this command, it undoes the last change.
What is the Emacs command to undo?
How do I continue commenting on the new line?
If you want to continue one comment of the type /* */ across several lines, use C-j ( newline-and-indent ).
How do I uncomment each line in a region in C?
In C mode and related modes, this command is bound to C-c C-c. The command M-x uncomment-region uncomments each line in the region; a numeric prefix argument specifies the number of comment delimiters to remove (negative arguments specify the number of comment delimiters to add).
How do I add a comment to a line in Emacs?
If the line is non-blank, the comment is placed after the last non-whitespace character on the line. Emacs tries to fit the comment between the columns specified by the variables comment-column and comment-fill-column (see Options for Comments ), if possible.
How do I add comment delimiters to a region?
When a region is active (see Mark ), M-; either adds comment delimiters to the region, or removes them. If every line in the region is already a comment, it uncomments each of those lines by removing their comment delimiters. Otherwise, it adds comment delimiters to enclose the text in the region.
What is comment-region-lines command in Linux?
It defines command comment-region-lines that comments or uncomments the current line, or the region if active. It is similar to comment-or-uncomment-region, but it lets you decide whether to uncomment or comment. It lets you nest comments, instead of automatically uncommenting the region if it is already commented out.