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Old 11-02-2012, 08:13 PM   #1
ted_chou12
Member
 
Registered: Aug 2010
Location: Zhongli, Taoyuan
Distribution: slackware, windows, debian (armv4l GNU/Linux)
Posts: 424
Blog Entries: 28

Rep: Reputation: 2
arithmetic error BUGGGGG


For a very looong looong time, I didn't realize why my script doesn't run at 8 and 9 am (no matter which timezone i was in) both US and Taiwan. Because I was too lazy to check and I can't wake up that early in the morning.
Code:
cookies="/tmp/pieayu.com_cookies.txt"

stime=$(($(date +%H)*10))
sleep $stime
.....
But now I realize why it doesn't:

Code:
# echo $((01*10))
10
# echo $((02*10))
20
# echo $((03*10))
30
# echo $((04*10))
40
# echo $((05*10))
50
# echo $((06*10))
60
# echo $((07*10))
70
# echo $((08*10))
-sh: arithmetic syntax error
# echo $((09*10))
-sh: arithmetic syntax error
# echo $((10*10))
100
# echo $((11*10))
110
# echo $((12*10))
120
# echo $((13*10))
130
# echo $((14*10))
140
# echo $((18*10))
180
# echo $((19*10))
190
# echo $((20*10))
200
# echo $((21*10))
210
Only when it is 08 and 09, the calculation doesn't work. I am pretty sure this is a bug, or else all 01-07 should not work as well, since the programmer intentionally designed for them to work, why do 08 and 09 don't?
If this is some binary related stuff not a bug, then let me know.
Thanks,
Ted

Last edited by ted_chou12; 11-02-2012 at 08:15 PM.
 
Old 11-02-2012, 08:53 PM   #2
AlucardZero
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Registered: May 2006
Location: USA
Distribution: Debian
Posts: 4,817

Rep: Reputation: 609Reputation: 609Reputation: 609Reputation: 609Reputation: 609Reputation: 609
Numbers starting with a 0 are interpreted as being in octal. 8 and 9 are invalid octal numbers. Lose the leading 0 or specify the base.

Code:
~$ echo $((10#8*10))
80
 
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