07-23-2013
Quote:
Originally Posted by
Skrynesaver
OS is a factor, as is filesystem, amount of free memory (esp. for Linux's read ahead ), I recommend faster disk storage or flash drives if you want to read files faster
grep is a pretty optimised command as it is...
Edit: Actually, on the locale issue, make sure "LC_COLLATE=Posix" if you're using ranges in grep.
Case matters in locale names. The POSIX Locale is all caps. Furthermore, on systems that conform to the IEEE's and ISO's
POSIX Standards or The Open Group's
Single UNIX Specifications, the C Locale and the POSIX Locale are identical. So
LC_COLLATE=C and
LC_COLLATE=POSIX have exactly the same effect.
LC_COLLATE=Posix might have the same effect, might yield an error, or might be a completely different locale on some systems; but it has no defined meaning in the standards.
On systems that conform to the C standard but neither the POSIX Standards nor the Single UNIX Specifications, the requirements for the C Locale are not as stringent and there is no definition for, nor any requirement that there even be, a POSIX Locale.
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LEARN ABOUT MOJAVE
locale5.18
locale(3pm) Perl Programmers Reference Guide locale(3pm)
NAME
locale - Perl pragma to use or avoid POSIX locales for built-in operations
SYNOPSIS
@x = sort @y; # Unicode sorting order
{
use locale;
@x = sort @y; # Locale-defined sorting order
}
@x = sort @y; # Unicode sorting order again
DESCRIPTION
This pragma tells the compiler to enable (or disable) the use of POSIX locales for built-in operations (for example, LC_CTYPE for regular
expressions, LC_COLLATE for string comparison, and LC_NUMERIC for number formatting). Each "use locale" or "no locale" affects statements
to the end of the enclosing BLOCK.
Starting in Perl 5.16, a hybrid mode for this pragma is available,
use locale ':not_characters';
which enables only the portions of locales that don't affect the character set (that is, all except LC_COLLATE and LC_CTYPE). This is
useful when mixing Unicode and locales, including UTF-8 locales.
use locale ':not_characters';
use open ":locale"; # Convert I/O to/from Unicode
use POSIX qw(locale_h); # Import the LC_ALL constant
setlocale(LC_ALL, ""); # Required for the next statement
# to take effect
printf "%.2f
", 12345.67' # Locale-defined formatting
@x = sort @y; # Unicode-defined sorting order.
# (Note that you will get better
# results using Unicode::Collate.)
See perllocale for more detailed information on how Perl supports locales.
NOTE
If your system does not support locales, then loading this module will cause the program to die with a message:
"Your vendor does not support locales, you cannot use the locale
module."
perl v5.18.2 2013-11-04 locale(3pm)