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Shell Programming and Scripting

Integer expression expected

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# 1  
Old 05-23-2012
Integer expression expected
Newb here

Code:
echo "$yesterdaysclose"
echo "$close"
if [ "$(echo "if (${yesterdaysclose} < ${close}) 1" | bc)" -eq 1 ] ; then
echo "stocks moving up"
elif [ "$(echo "if (${yesterdaysclose} > ${close}) 1" | bc)" -eq 1 ] ; then
echo "stock is moving down"
else
echo "no change"
fi

seems to evaluate the floating decimal correctly however returns

./shellscript1.sh: line 17: [: : integer expression expected
./shellscript1.sh: line 19: [: : integer expression expected

ideas?
# 2  
Old 05-23-2012
what is the yesterdaysclose and close? are they equal ?
# 3  
Old 05-23-2012
yesterdayclose and close could be equal but usually are not

Code:
9.97
9.97
./shellscript1.sh: line 17: [: : integer expression expected
./shellscript1.sh: line 19: [: : integer expression expected
no change

11.69
11.29
./shellscript1.sh: line 17: [: : integer expression expected
stock is moving down

# 4  
Old 05-23-2012
if --> yesterdaysclose bigger(>) or equal(=) to close val..
Code:
$(echo "if (${yesterdaysclose} < ${close}) 1" | bc) --> equals to NULL (because conditon is false )

and [ test command does not compare with NULL and integer
you maybe use [[ .. ]] double square brackets for escape any error..
This User Gave Thanks to ygemici For This Post:
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