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Converting string to negative decimal value

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# 1  
Old 03-16-2012
Converting string to negative decimal value
I need code for converting a string to a negative decimal value.
For ex, i have the value in the form of a string (5489.95-) i need to convert it into decimal value (-5489.95) while getting output using printf command.

i know how to get as a string
a="5489.95-"
printf "%10s"$a >>xyz.dat

need as a decimal value
# 2  
Old 03-16-2012
Code:
a="-${a%?}"

# 3  
Old 03-16-2012
Hi,
Actually the string value is obtained from another file.It can be either a postive number or a negative number in the form of a string.
If it is a psotive(547665.98) get a positive decimal value itself( 547665.98), but if it is a negative(547665.98-) get it as a negative decimal value (-547665.98).

Thanks
# 4  
Old 03-17-2012
Code:
if [ `echo $a | grep "\-$"` ]; then a="-${a%?}"; fi

This User Gave Thanks to balajesuri For This Post:
angie1234
# 5  
Old 03-18-2012
MySQL
Thanks a lot!! It works fine.
# 6  
Old 03-18-2012
Without externals commands (faster):
Code:
case $a in (*-) a=-${a%?}; esac

or in bash/ksh93:
Code:
a=${a/*-/-${a%?}}

Last edited by Scrutinizer; 03-18-2012 at 08:01 AM..
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