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jamiefuller is offline jamiefuller
04-27-2012 , 11:02 AM
Posts: 145 | Thanked: 301 times | Joined on Jan 2010 @ Milton Keynes, UK
#1
Hi All,

I think i've found a little bug but would love for someone to confirm?

Basically I have this script
Code:
IN=00:08:19.12
IN=`echo $IN| cut -d'.' -f 1`

arr=$(echo $IN | tr ":" "\n")
a=0
for x in $arr
do
	echo $x
	a=$(( ( a * 60) + x ))
	echo $a
done
it should take IN and convert it into seconds.

This works on a unix box that I had access to but on the N900 I get the following error

Code:
Nokia-N900:/home/user/MyDocs# sh test
00
0
08
test: line 12: syntax error:  ( a * 60) + x
Could somebody recreate and confirm? or point out what I'm doing daft? =)

Thanks
jamie

UPDATE:

I've found that if I set IN to the following it works except for the lines in red italics? how wierd is that?

IN=00:00:19.12
IN=00:01:19.12
IN=00:02:19.12
IN=00:03:19.12
IN=00:04:19.12
IN=00:05:19.12
IN=00:06:19.12
IN=00:07:19.12
IN=00:08:19.12
IN=00:09:19.12
IN=00:10:19.12
IN=00:11:19.12
IN=00:12:19.12
IN=00:13:19.12
IN=00:14:19.12
IN=00:15:19.12
IN=00:16:19.12
IN=00:17:19.12
IN=00:18:19.12
IN=00:19:19.12
IN=00:20:19.12
Last edited by jamiefuller; 04-27-2012 at 11:08 AM.
 
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nicolai is offline nicolai
04-27-2012 , 11:19 AM
Posts: 1,621 | Thanked: 4,302 times | Joined on Apr 2009 @ Germany
#2
08
Integers with leading "0" are interpreted as octal, so 08 is an illegal
octal number.
Remove the leading "0".

Nicolai
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jamiefuller is offline jamiefuller
04-27-2012 , 11:32 AM
Posts: 145 | Thanked: 301 times | Joined on Jan 2010 @ Milton Keynes, UK
#3
Originally Posted by nicolai View Post
08
Integers with leading "0" are interpreted as octal, so 08 is an illegal
octal number.
Remove the leading "0".

Nicolai
Thanks Nicolai,

any chance of a code snipet as to how to remove the trailing zero?

Or just a better way of doing what I'm doing =)

Thanks
Jamie
 
retsaw is offline retsaw
04-27-2012 , 11:37 AM
Posts: 701 | Thanked: 582 times | Joined on Sep 2010 @ London, England
#4
You can use bc to do the maths (you may need to install it)
Code:
	a=$(echo "( $a * 60 ) + $x" | bc )
 

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jamiefuller is offline jamiefuller
04-27-2012 , 11:52 AM
Posts: 145 | Thanked: 301 times | Joined on Jan 2010 @ Milton Keynes, UK
#5
retsaw, that was perfect, thanks!
 
gregoranderson is offline gregoranderson
04-27-2012 , 12:40 PM
Posts: 245 | Thanked: 348 times | Joined on Jul 2010 @ Scotland
#6
Following on from Nicolai's explanation - an alternative to using bc is to force bash to interpret the value as decimal, thus having the added option of the leading zero being chopped:

Code:
#!/bin/bash

LIFE=042

# Will return 34 as LIFE is interpreted as octal
echo $((LIFE))

# Force decimal representation
LIFE=$((10#${LIFE}))

# Should return the proper meaning of life 
echo $((LIFE))
 

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retsaw is offline retsaw
04-27-2012 , 12:58 PM
Posts: 701 | Thanked: 582 times | Joined on Sep 2010 @ London, England
#7
Which while it works with bash, the N900 by default uses the ash shell built in to busybox and it doesn't work with that.
 

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gregoranderson is offline gregoranderson
04-27-2012 , 01:06 PM
Posts: 245 | Thanked: 348 times | Joined on Jul 2010 @ Scotland
#8
Originally Posted by retsaw View Post
Which while it works with bash, the N900 by default uses the ash shell built in to busybox and it doesn't work with that.
/me facepalms.

Fair point, well made! Apologies
 

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misiak is offline misiak
04-27-2012 , 02:07 PM
Posts: 574 | Thanked: 903 times | Joined on Feb 2010 @ Gdynia, Poland
#9
Originally Posted by gregoranderson View Post
/me facepalms.

Fair point, well made! Apologies
But the title of this threas states explicitly that this question is about bash, so no need to facepalm Unless for OP "any shell"=="bash" which is a common misunderstanding (and a reason to facepalm for OP), but I doubt it
 

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retsaw is offline retsaw
04-27-2012 , 02:32 PM
Posts: 701 | Thanked: 582 times | Joined on Sep 2010 @ London, England
#10
That point hadn't passed me by, but I also noted the error message was from Busybox's Ash shell as Bash gives a slightly different error. But I agree, there's no need for the facepalm, it was a useful post nonetheless and Bash was mentioned in the title.
 

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