问题
I want gawk to parse number using comma , as the decimal point character.
So I set LC_NUMERIC to fr_FR.utf-8 but it does not work:
echo 123,2 | LC_NUMERIC=fr_FR.utf-8 gawk '{printf ("%.2f\n", $1 + 0) }'
123.00
The solution is to specify option --posix or export POSIXLY_CORRECT=1 but in this case the GNU awk extensions are not available, for example delete or the gensub function:
echo 123,2 | LC_NUMERIC=fr_FR.utf-8 gawk --posix '{printf ("%.2f\n", $1 + 0) }'
123,20
Is it possible to have gawk parsing number with , as decimal point without specifying
POSIX option?
回答1:
The option your are looking for is:
--use-lc-numeric
This forces gawk to use the locale's decimal point character when parsing input data. Although the POSIX standard requires this behavior, and gawk does so when --posix is in effect, the default is to follow traditional behavior and use a period as the decimal point, even in locales where the period is not the decimal point character. This option overrides the default behavior, without the full draconian strictness of the --posix option.
Demo:
$ echo 123,2 | LC_NUMERIC=fr_FR.utf-8 awk --use-lc-numeric '{printf "%.2f\n",$1}'
123,20
Notes: printf is statement not a function so the parenthesis are not required and I'm not sure why you are adding zero here?
来源：https://stackoverflow.com/questions/16832395/gawk-floating-point-number-localization