Nk_percent

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Description

Easy way to get the percent when given two numbers.

Best way to think about this is asking: “A is what percent of B?”

If either of the two arguments is empty or the first argument is zero, the function returns “ERR%” as a single-word error message.

Otherwise, the two arguments are piped to awk, which performs the calculation and prints the result as a percentage rounded to four decimal places. The result is then printed with a “%” symbol appended to it.

Example

[root@cloudvpsserver scripts]# nk_percent 18 254
7.08%

Code

nk_percent() {
# If nothing is provided, or we try to divide by zero. Report back ERR%
# We just want a single word error message since this is embeded in other scripts which expect a single word response.
if [ "$1" = "" ] || [ "$2" = "" ] || [ "$1" = "0" ]; then
   echo "ERR%"
   return 0
fi
# Otherwise pipe the values to awk which does some math and prints out the result.
    echo "$1" "$2" | awk '{printf("%.4s\n", ($1/$2)*100)}' | awk '{print $1"%"}'
}