




Arguments: None
Key sequence: 
Alt+Q
Fills the current paragraph. If the current point is located between two paragraphs, the next paragraph is filled.
A prefix argument causes the current fill operation to use that value, rather than the value of Fill-Column.
Arguments: None
Key sequence: 
Alt+G
Fills the region from the current point to the mark.
A prefix argument causes the current fill operation to use that value, rather than the value of Fill-Column.
Determines the column at which text in the current buffer is forced on to a new line.
Arguments: None
Key sequence: 
Ctrl+X F
Sets the value of Fill-Column, for the current buffer, as the column of the current point.
A prefix argument causes Fill-Column to be set at the required value.
Defines a string which is excluded when each line of the current buffer is re-formatted using the filling commands. For example, if the 
Fill-Prefix
 is set to 
;;
, then these characters at the start of a line is skipped over when the text is re-formatted, so it is possible to re-format Lisp comments. If the 
Fill-Prefix
 is 
nil
, no characters are excluded when text is filled.
If a 
Fill-Prefix
 is defined, any line that does not begin with the 
Fill-Prefix 
is considered to begin a new paragraph. Therefore, any re-formatting of comments in Lisp code does not intrude outside the commented lines.
Arguments: None
Key sequence: 
Ctrl+X .
Sets the 
Fill-Prefix 
of the current buffer to be the text from the beginning of the current line up to the current point. The 
Fill-Prefix
 may be set to 
nil
 by using this command with the current point at the start of a line.
Arguments: None
Key sequence: None
Centers the current line with reference to the current value of 
Fill-Column
.
A prefix argument causes the current line to be centered with reference to the required width.