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This may help

ema=`echo "(${currentprice} * 0.153846154) + (${previousema} * (1 - 0.153846154))" | bc`

You are mixing more than one command.

ema=$(echo "($currentprice*0.153846154)+($previousema*(1-0.153846154))" | bc)

if [ "$ema" -eq 1 ]; then
echo do something
fi

if --> yesterdaysclose bigger(>) or equal(=) to close val..
$(echo "if (${yesterdaysclose} < ${close}) 1" | bc) --> equals to NULL (because conditon is false )
and [ test command does not compare...

Hi pravin,

The '-flag is not in the POSIX specification of the printf utility itself:printf utility: extended description...