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+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+
+Pack is a simple version of the traditional Unix ar tool.
+It implements only the operations needed by Go.
+
+Usage:
+	go tool pack op file.a [name...]
+
+Pack applies the operation to the archive, using the names as arguments to the operation.
+
+The operation op is given by one of these letters:
+
+	c	append files (from the file system) to a new archive
+	p	print files from the archive
+	r	append files (from the file system) to the archive
+	t	list files from the archive
+	x	extract files from the archive
+
+The archive argument to the c command must be non-existent or a
+valid archive file, which will be cleared before adding new entries. It
+is an error if the file exists but is not an archive.
+
+For the p, t, and x commands, listing no names on the command line
+causes the operation to apply to all files in the archive.
+
+In contrast to Unix ar, the r operation always appends to the archive,
+even if a file with the given name already exists in the archive. In this way
+pack's r operation is more like Unix ar's rq operation.
+
+Adding the letter v to an operation, as in pv or rv, enables verbose operation:
+For the c and r commands, names are printed as files are added.
+For the p command, each file is prefixed by the name on a line by itself.
+For the t command, the listing includes additional file metadata.
+For the x command, names are printed as files are extracted.
+
+*/
+package main