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~ubuntu-branches/ubuntu/trusty/bash/trusty-security 

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echo_argc()
{
	echo $#
}

a()
{
	shift
	echo_argc "$@"
	echo_argc ${1:+"$@"}
	echo_argc "${1:+$@}"
	echo_argc 1 2 3
}

b()
{
	_IFS="$IFS"
	IFS="$1"
	shift
	echo_argc "$@"
	echo_argc ${1:+"$@"}
	echo_argc "${1:+$@}"
	echo_argc 1 2 3
	IFS="$_IFS"
}

a "X" foo bar hoge

b "X" foo bar hoge