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Updated usage information because of removed short parameters.

Signed-off-by: Robin Schneider <ypid@riseup.net>

Robin Schneider authored on 2015/07/16 17:44:58
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@@ -4,7 +4,7 @@ set -e
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 mkimg="$(basename "$0")"
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 usage() {
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-	echo >&2 "usage: $mkimg [-d dir] [-t tag] [-c compression] script [script-args]"
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+	echo >&2 "usage: $mkimg [-d dir] [-t tag] [--compression algo| --no-compression] script [script-args]"
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 	echo >&2 "   ie: $mkimg -t someuser/debian debootstrap --variant=minbase jessie"
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 	echo >&2 "       $mkimg -t someuser/ubuntu debootstrap --include=ubuntu-minimal --components=main,universe trusty"
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 	echo >&2 "       $mkimg -t someuser/busybox busybox-static"