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You can use comparison operators (<, >, <=, >=, ==, !=) to compare the decimal output with a specific value, and then use the if-else statement based on the result of the comparison. Here is an example:
awk '{num=$1*0.5; if (num > 10.5) print "Greater than 10.5"; else print "Less than or equal to 10.5";}' input.txt
In this example, the decimal output is multiplied by 0.5 and stored in the variable 'num'. If the value of 'num' is greater than 10.5, the if statement will print "Greater than 10.5", otherwise it will print "Less than or equal to 10.5". The input file 'input.txt' contains the decimal values to be processed.