Из любопытства я протестировал это в системе Arch Linux:
$ uname -r
4.4.5-1-ARCH
$ df -h .
Filesystem Size Used Avail Use% Mounted on
tmpfs 3.9G 720K 3.9G 1% /tmp
$ dd if=/dev/urandom bs=1M count=1K | base64 > foo
$ df -h .
Filesystem Size Used Avail Use% Mounted on
tmpfs 3.9G 1.4G 2.6G 35% /tmp
$ for i in {1..100}; do /usr/bin/time -f '%e' -ao grep.log grep -iq foobar foo; done
$ for i in {1..100}; do /usr/bin/time -f '%e' -ao egrep.log egrep -q '[fF][oO][oO][bB][aA][rR]' foo; done
$ grep --version
grep (GNU grep) 2.23
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later .
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Written by Mike Haertel and others, see .
А затем некоторая статистика любезно предоставлена Есть ли способ получить мин., макс., медиана и среднее для списка чисел в одной команде? :
$ R -q -e "x <- read.csv('grep.log', header = F); summary(x); sd(x[ , 1])"
> x <- read.csv('grep.log', header = F); summary(x); sd(x[ , 1])
V1
Min. :1.330
1st Qu.:1.347
Median :1.360
Mean :1.362
3rd Qu.:1.370
Max. :1.440
[1] 0.02322725
>
>
$ R -q -e "x <- read.csv('egrep.log', header = F); summary(x); sd(x[ , 1])"
> x <- read.csv('egrep.log', header = F); summary(x); sd(x[ , 1])
V1
Min. :1.330
1st Qu.:1.340
Median :1.360
Mean :1.365
3rd Qu.:1.380
Max. :1.430
[1] 0.02320288
>
>
Я использую локаль en_GB.utf8
, но время почти неразличимо.
Из справочной страницы локали:
Programs in the OpenBSD base system ignore the locale except for the character encoding, and it is not recommended to use any of these variables except that the following non-default setting is supported as an option:
export LC_CTYPE=en_US.UTF-8
Затем установка LC_CTYPE
на pt_BR.UTF-8
работает, и теперь я получаю правильные имена файлов.