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Previous version would give you the represented value as a possibly rounded decimal number and the same number with the increased precision
#Convert mac address to float point bash update#
Printf '%.0f\n' "$((10.3))" # and not printf '%.0f\n' 10.There has been an update in the way the number is displayed. It's good in a way in that you can use floating point constants in your scripts that use the period and not have to worry that it will stop working in other locales, but still be able to deal with the numbers as expressed by the user as long as you remember to do: var=$((10.3)) # and not var=10.3 yash: arithmetic: `,' is not a valid number or operator Yash honours the locale's decimal separator on output, but not for the floating point literal constants in its arithmetic expressions, which can cause surprises: $ LC_ALL=fr_FR.UTF-8. Note however that it truncates the decimal part, it doesn't give you the nearest integer: $ echo "$(( 0.237e2 | 0 ))" You can convert a number to integer though by using the binary or operator for instance (also works in zsh but not in ksh93). Yash also supports floating point arithmetic but doesn't have math functions like ksh93/ zsh's rint(). locale, and the same as $((1, 2)), that is 2 in an English locale).
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You could also do: integer i=$(( rint(f) ))īeware that ksh93 floating point arithmetic honour the decimal separator setting in the locale (even though, is otherwise a math operator ( $((1,2)) would be 6/5 in a French/German. Which doesn't fork either but also doesn't go all the trouble of creating a fake subshell environment.īut beware of: $ echo "$(( rint(1e18) ))" ksh93 optimises command substitution by not using a pipe or forking when the commands are only builtin commands. Ksh93 was the first Bourne-like shell to support floating point arithmetic. However note that while doubles can represent very large numbers, integers are much more limited. In zsh (which supports floating point arithmetic (decimal separator is always the period)), you have the rint() math function to give you the nearest integer as a float (like in C) and int() to give you an integer from a float (like in awk). }' one is not affected by the locale (the comma cannot be a decimal separator in awk since it's already a special character in the syntax there ( print 1,2, same as print 1, 2 to pass two arguments to print) zsh Is not POSIX as %f is not required to be supported by POSIX. With yash, you can also do: printf '%.0f' "$(($float))" So, if your floats are always expressed with the period as the decimal separator and you want it to be treated as such by printf regardless of the locale of the user invoking your script, you'd need to fix the locale to C: LC_ALL=C printf '%.0f' "$float" You do get an integer, but chances are that you won't be able to use that integer anywhere.Īlso, as noted by in several printf implementations (bash, ksh93, yash, not GNU, zsh, dash), it is affected by the locale (the decimal separator which can be. If you need the result in a variable, you could use command substitution, or the bash specific (though now also supported by zsh): printf -v int %.0f "$float"īut that would remove the fractional part instead of giving you the nearest integer and that wouldn't work for values of $float like 1.2e9 or.
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In bash, that's probably as good as it gets.