[SOLVED] Subtracting years from current year

[Trapper]

I have a script:

#!/bin/bash
THEYEAR=2011
LASTYEAR=$(($THEYEAR - 1))
echo $THEYEAR
echo $LASTYEAR

I get:

2011
2010

I have another script:

#!/bin/bash
THEYEAR=TZ=EST-24 date +20%y
LASTYEAR=$(($THEYEAR - 1))
echo $THEYEAR
echo $LASTYEAR

I get:

2011

-1

THEYEAR is correct but then I get a line space and then a -1 for LASTYEAR.

I can't figure out why.

[pratapsingh]

try this
#!/bin/bash
THEYEAR=`TZ=EST-24 date +20%y`
echo "$THEYEAR the year";
LASTYEAR=$((`echo $THEYEAR`-1))
echo $THEYEAR
echo $LASTYEAR

[Trapper]

try this
#!/bin/bash
THEYEAR=`TZ=EST-24 date +20%y`
echo "$THEYEAR the year";
LASTYEAR=$((`echo $THEYEAR`-1))
echo $THEYEAR
echo $LASTYEAR

Yup, this works and I see the errors of my ways. Thanks for your help pratapsingh.

Trapper