skip entries 1 to 9.

			Note: While this command is executing, the Syntax
			autocommand event is disabled by adding it to
			'eventignore'.  This considerably speeds up editing
			each buffer.
			Also see |:bufdo|, |:tabdo|, |:argdo|, |:windo|,
			|:ldo|, |:cfdo| and |:lfdo|.

							*:cfdo*
:cfdo[!] {cmd}		Execute {cmd} in each file in the quickfix list.
			It works like doing this: >
				:cfirst
				:{cmd}
				:cnfile
				:{cmd}
				etc.
<			Otherwise it works the same as `:cdo`.

							*:ldo*
:ld[o][!] {cmd}		Execute {cmd} in each valid entry in the location list
			for the current window.
			It works like doing this: >
				:lfirst
				:{cmd}
				:lnext
				:{cmd}
				etc.
<			Only valid entries in the location list are used.
			Otherwise it works the same as `:cdo`.

							*:lfdo*
:lfdo[!] {cmd}		Execute {cmd} in each file in the location list for
			the current window.
			It works like doing this: >
				:lfirst
				:{cmd}
				:lnfile
				:{cmd}
				etc.
<			Otherwise it works the same as `:ldo`.

FILTERING A QUICKFIX OR LOCATION LIST:
		    *cfilter-plugin* *:Cfilter* *:Lfilter* *package-cfilter*
If you have too many entries in a quickfix list, you can use the cfilter
plugin to reduce the number of entries.  Load the plugin with: >vim

    packadd cfilter

Then you can use the following commands to filter a quickfix/location list: >

    :Cfilter[!] /{pat}/
    :Lfilter[!] /{pat}/

The |:Cfilter| command creates a new quickfix list from the entries matching
{pat} in the current quickfix list. {pat} is a Vim |regular-expression|
pattern. Both the file name and the text of the entries are matched against
{pat}. If the optional ! is supplied, then the entries not matching {pat} are
used. The pattern can be optionally enclosed using one of the following
characters: ', ", /. If the pattern is empty, then the last used search
pattern is used.

The |:Lfilter| command does the same as |:Cfilter| but operates on the current
location list.

The current quickfix/location list is not modified by these commands, so you
can go back to the unfiltered list using the |:colder|/|:lolder| command.

=============================================================================
2. The error window					*quickfix-window*

					    *:cope* *:copen* *w:quickfix_title*
:cope[n] [height]	Open a window to show the current list of errors.

			When [height] is given, the window becomes that high
			(if there is room).  When [height] is omitted the
			window is made ten lines high.

			If there already is a quickfix window, it will be made
			the current window.  It is not possible to open a
			second quickfix window.  If [height] is given the
			existing window will be resized to it.

							*quickfix-buffer*
			The window will contain a special buffer, with
			'buftype' equal to "quickfix".  Don't change this!
			The window will have the w:quickfix_title variable set
			which will indicate the command that produced the
			quickfix list. This can be used to compose a custom
			status line if the value of 'statusline' is adjusted
			properly. Whenever this buffer is modified by a
			quickfix command or function, the |b:changedtick|
			variable is incremented.  You can get the number of
			this buffer using the getqflist() and getloclist()
			functions by passing the "qfbufnr" item. For a
			location list, this buffer is wiped out when the
			location list is removed.

							*:lop* *:lopen*
:lop[en] [height]	Open a window to show the location list for the
			current window. Works only when the location list for
			the current window is present.  You can have more than
			one location window opened at a time.  Otherwise, it
			acts the same as ":copen".

							*:ccl* *:cclose*
:ccl[ose]		Close the quickfix window.

							*:lcl* *:lclose*
:lcl[ose]		Close the window showing the location list for the
			current window.

							*:cw* *:cwindow*
:cw[indow] [height]	Open the quickfix window when there are recognized
			errors.  If the window is already