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A name will improve the usege, example
# virsh help echo
NAME
echo - echo arguments
SYNOPSIS
echo [--shell] [--xml] [<string>]...
DESCRIPTION
Echo back arguments, possibly with quoting.
OPTIONS
--shell escape for shell use
--xml escape for XML use
<string> arguments to echo
"[<string>]..." is added to SYNOPSIS.
"<string> arguments to echo" is added to OPTIONS.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>