Linux Bash Scripting Again....

[TheExcession]

Bit stuck with a small problem:

I pass a date into my shell script as say 20040901 - 1st Sept 2004 - as STARTDATE

Then
declare -i STARTYEAR="${STARTDATE:0:4}"
declare -i STARTMONTH="${STARTDATE:4:2}"
declare -i STARTDAY="${STARTDATE:6:2}"

trouble is STARTMONTH gets forced into base 8 due to the leading zero on '09' and then unsurprisingly gives a value too large for base error.

Is their a quick easy way to ensure I get a decimal value for '08' and '09'? Similar problem occurs with some of the day values too...

many thanks
Ex

[GregE240]

TheExcession said:

Bit stuck with a small problem: I pass a date into my shell script as say 20040901 - 1st Sept 2004 - as STARTDATE Then declare -i STARTYEAR="${STARTDATE:0:4}" declare -i STARTMONTH="${STARTDATE:4:2}" declare -i STARTDAY="${STARTDATE:6:2}" trouble is STARTMONTH gets forced into base 8 due to the leading zero on '09' and then unsurprisingly gives a value too large for base error. Is their a quick easy way to ensure I get a decimal value for '08' and '09'? Similar problem occurs with some of the day values too... many thanks Ex

Ex, maybe I'm barking up the wrong tree, but are you sure about base 8?

Its just that 9 in base 8 is 11?

Greg

[TheExcession]

GregE240 said:

TheExcession said: Bit stuck with a small problem: I pass a date into my shell script as say 20040901 - 1st Sept 2004 - as STARTDATE Then declare -i STARTYEAR="${STARTDATE:0:4}" declare -i STARTMONTH="${STARTDATE:4:2}" declare -i STARTDAY="${STARTDATE:6:2}" trouble is STARTMONTH gets forced into base 8 due to the leading zero on '09' and then unsurprisingly gives a value too large for base error. Is their a quick easy way to ensure I get a decimal value for '08' and '09'? Similar problem occurs with some of the day values too... many thanks Ex Ex, maybe I'm barking up the wrong tree, but are you sure about base 8? Its just that 9 in base 8 is 11? Greg

true base 8 goes:
0,1,2,3,4,5,6,7,10,11,12,13,14,15,16,17,20,21....

but when bash sees a leading zero on a value and assigns it to a script variable the leading zero is interepetted as being an instruction to force into base 8 - which throws an error - I need to force it into base 10 -

or write something to drop the leading zero before doing the assignment.

Just need sumfin quick and simple and not sure what to do.

thanks
Ex

>> Edited by TheExcession on Thursday 28th October 10:30

[zumbruk]

The real problem is that you're trying to do implicit ASCII to integer conversion and bash doesn't understand what you mean.

Unfortunately, I can't really help you, 'cos I write anything that requires that kind of functionality in Perl.

Sorry.

[ATG]

horrific, but can you concatenate a leading 1 onto your string, convert that to an integer, then subtract 100?

[zumbruk]

Slightly less horrifically, can you catenate "10#" onto the beginning of your string which specifies the radix of the number?

(Works for any base, BTW.)

[TheExcession]

zumbruk said:

Slightly less horrifically, can you catenate "10#" onto the beginning of your string which specifies the radix of the number? (Works for any base, BTW.)

Thanks zumbruk, that works a treat:
declare -i STARTMONTH="10#${STARTDATE:4:2}" etc...

best
Ex

[zumbruk]

You're welcome. No worries.