问题
For some reason, comparisons of negative floating point numbers with awk and sort seem to be broken on my machine. It seems that -0.1 < -0.2.
When I try to sort
0.2
-0.1
-0.2
0.1
0
using sort -n test.dat, I get
-0.1
-0.2
0
0.1
0.2
instead of
-0.2
-0.1
0
0.1
0.2
What is wrong with me?
回答1:
Answer: You are French!
In french, the decimal point is a comma (,) and not a dot (.). You need to either replace the dots with commas or change your locale.
Try LC_NUMERIC=us_EN.UTF-8 sort -n test.dat and you should get the expected result.
For your information, LC_NUMERIC is an environment variable that contains the locale to use for formatting non-monetary numbers.
来源：https://stackoverflow.com/questions/19985823/negative-floating-point-numbers-are-not-sorted-correctly-using-awk-or-sort