[PATCH v2] update-rc.d: Fix enable/disable command

[PATCH v2] update-rc.d: Fix enable/disable command

[Einar Gunnarsson]

Now works for any number 01-99 in both bash and busybox sh.

$[] is a bashism and does not work on POSIX shells.
Links numbered 91-99 created a single digit link.
Links numbered 08 and 09 gave the error:
'bash: 100-08: value too great for base (error token is "08")'

Signed-off-by: Einar Gunnarsson <tolvupostur@gmail.com>
---
 update-rc.d | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/update-rc.d b/update-rc.d
index c9355d7..95d1c22 100644
--- a/update-rc.d
+++ b/update-rc.d
@@ -114,7 +114,7 @@ renamelink()
         # or stop link to start link with a sequence number equal to the difference of 100 minus the original sequence number.
 	if ls ${etcd}${lev}.d/${oldstartstop}*${bn} >/dev/null 2>&1; then
 		oldnn=`basename ${etcd}${lev}.d/${oldstartstop}*${bn}|cut -c2-3`
-		newnn=$[100-$oldnn]
+		newnn=$(printf "%02d" $((100-${oldnn#0})))
 		[ $verbose -eq 1 ] && echo "rename ${etcd}${lev}.d/${oldstartstop}${oldnn}${bn} -> ${etcd}${lev}.d/${newstartstop}${newnn}${bn}"
 		if [ $notreally -eq 0 ];then
 			mv ${etcd}${lev}.d/${oldstartstop}${oldnn}${bn} ${etcd}${lev}.d/${newstartstop}${newnn}${bn}
-- 
2.17.1