merge(third_party/git): Merge squashed git subtree at v2.23.0 r/373

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+git-clean(1)
+============
+
+NAME
+----
+git-clean - Remove untracked files from the working tree
+
+SYNOPSIS
+--------
+[verse]
+'git clean' [-d] [-f] [-i] [-n] [-q] [-e <pattern>] [-x | -X] [--] <path>...
+
+DESCRIPTION
+-----------
+
+Cleans the working tree by recursively removing files that are not
+under version control, starting from the current directory.
+
+Normally, only files unknown to Git are removed, but if the `-x`
+option is specified, ignored files are also removed. This can, for
+example, be useful to remove all build products.
+
+If any optional `<path>...` arguments are given, only those paths
+are affected.
+
+OPTIONS
+-------
+-d::
+	Remove untracked directories in addition to untracked files.
+	If an untracked directory is managed by a different Git
+	repository, it is not removed by default.  Use -f option twice
+	if you really want to remove such a directory.
+
+-f::
+--force::
+	If the Git configuration variable clean.requireForce is not set
+	to false, 'git clean' will refuse to delete files or directories
+	unless given -f, -n or -i. Git will refuse to delete directories
+	with .git sub directory or file unless a second -f
+	is given.
+
+-i::
+--interactive::
+	Show what would be done and clean files interactively. See
+	``Interactive mode'' for details.
+
+-n::
+--dry-run::
+	Don't actually remove anything, just show what would be done.
+
+-q::
+--quiet::
+	Be quiet, only report errors, but not the files that are
+	successfully removed.
+
+-e <pattern>::
+--exclude=<pattern>::
+	Use the given exclude pattern in addition to the standard ignore rules
+	(see linkgit:gitignore[5]).
+
+-x::
+	Don't use the standard ignore rules (see linkgit:gitignore[5]), but
+	still use the ignore rules given with `-e` options from the command
+	line.  This allows removing all untracked
+	files, including build products.  This can be used (possibly in
+	conjunction with 'git restore' or 'git reset') to create a pristine
+	working directory to test a clean build.
+
+-X::
+	Remove only files ignored by Git.  This may be useful to rebuild
+	everything from scratch, but keep manually created files.
+
+Interactive mode
+----------------
+When the command enters the interactive mode, it shows the
+files and directories to be cleaned, and goes into its
+interactive command loop.
+
+The command loop shows the list of subcommands available, and
+gives a prompt "What now> ".  In general, when the prompt ends
+with a single '>', you can pick only one of the choices given
+and type return, like this:
+
+------------
+    *** Commands ***
+	1: clean                2: filter by pattern    3: select by numbers
+	4: ask each             5: quit                 6: help
+    What now> 1
+------------
+
+You also could say `c` or `clean` above as long as the choice is unique.
+
+The main command loop has 6 subcommands.
+
+clean::
+
+   Start cleaning files and directories, and then quit.
+
+filter by pattern::
+
+   This shows the files and directories to be deleted and issues an
+   "Input ignore patterns>>" prompt. You can input space-separated
+   patterns to exclude files and directories from deletion.
+   E.g. "*.c *.h" will excludes files end with ".c" and ".h" from
+   deletion. When you are satisfied with the filtered result, press
+   ENTER (empty) back to the main menu.
+
+select by numbers::
+
+   This shows the files and directories to be deleted and issues an
+   "Select items to delete>>" prompt. When the prompt ends with double
+   '>>' like this, you can make more than one selection, concatenated
+   with whitespace or comma.  Also you can say ranges.  E.g. "2-5 7,9"
+   to choose 2,3,4,5,7,9 from the list.  If the second number in a
+   range is omitted, all remaining items are selected.  E.g. "7-" to
+   choose 7,8,9 from the list.  You can say '*' to choose everything.
+   Also when you are satisfied with the filtered result, press ENTER
+   (empty) back to the main menu.
+
+ask each::
+
+  This will start to clean, and you must confirm one by one in order
+  to delete items. Please note that this action is not as efficient
+  as the above two actions.
+
+quit::
+
+  This lets you quit without do cleaning.
+
+help::
+
+  Show brief usage of interactive git-clean.
+
+SEE ALSO
+--------
+linkgit:gitignore[5]
+
+GIT
+---
+Part of the linkgit:git[1] suite