Add an error message if number of arguments is incorrect
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			@ -3,6 +3,11 @@ set -e
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version="$1"
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if [ -z "$version" ]; then
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	echo "Usage: $0 version"
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	exit 1
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fi
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ln -sf ../downloads/$version latest/directory
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for f in $(ls "downloads/$version/"); do \
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    ln -sf "../downloads/$version/$f" latest/$(echo $f | sed -e "s@-$version@@")
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