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Top Forums UNIX for Advanced & Expert Users penalty for case insensitive grep Post 302499822 by methyl on Friday 25th of February 2011 01:06:41 PM
Old 02-25-2011
This problem has cropped up a few times recently.

The default "locale" for GNU utility programs including "grep" and "sort" has changed to "UTF" which means that mapping one "character" can take more than one character. If your file definitely does not contain "UTF" characters you can massively improve performance by changing your locale back to the basic value of "C".

To check how your system is now, type and check the output from this enquiry:
Code:
locale

This User Gave Thanks to methyl For This Post:
 

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uxterm(1)						      General Commands Manual							 uxterm(1)

NAME
uxterm - X terminal emulator for Unicode (UTF-8) environments SYNOPSIS
uxterm [ xterm-options ] DESCRIPTION
uxterm is a wrapper around the xterm(1) program that invokes the latter program with the 'UXTerm' X resource class set. All arguments to uxterm are passed to xterm without processing; the -class and -u8 options should not be specified because they are used by the wrapper. See the xterm manual page for more information on xterm-options. The environment's locale settings (see "ENVIRONMENT" below) are used to discern the locale's character set. If no current locale can be determined, the locale 'en_US' (the English language as used in the territory of the United States) is assumed. The locale(1) utility is used to determine whether the system supports the selected locale. If it does not, uxterm will exit with an error and report the output of locale. Note: uxterm may produce unexpected results if the current locale is set to one in which the UTF-8 character encoding is not supported, or if fonts using the ISO 10646-1 character set are not available. In the Debian system, the 'xfonts-base' package provides the fonts that uxterm uses by default. To change the fonts uxterm uses, edit the /etc/X11/app-defaults/UXTerm file. A similar wrapper, koi8rxterm(1), is available for KOI8-R environments. ENVIRONMENT
LC_ALL, LC_CTYPE, LANG The values of these variables are checked, in order, to determine the character set used by the current locale. AUTHOR
Thomas Dickey SEE ALSO
locale(1), locale(7), koi8rxterm(1), xterm(1) Debian Project 2004-12-19 uxterm(1)
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