Shell float to integer conversion and integer arithmetic

shell_float_to_integer.sh

# Start with a float number
NP_TRIGGER_VALUES=999.23

# Convert float to integer value as shell supports only integer arithmetic not float
CURRENT_QUEUE_COUNT=$(printf "%.0f" $NP_TRIGGER_VALUES )

# Integer value
DYNO_CAPACITY=500

# Division; Give a space before and after the operator - shell gotcha
REQUIRED_DYNO_COUNT=`expr $CURRENT_QUEUE_COUNT / $DYNO

# Shell by default rounds down. So for roundup, manually add +1
REQUIRED_DYNO_COUNT=`expr $REQUIRED_DYNO_COUNT + 1`