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Full Discussion: penalty for case insensitive grep
Top Forums UNIX for Advanced & Expert Users penalty for case insensitive grep Post 302499838 by phil518 on Friday 25th of February 2011 01:49:12 PM
Old 02-25-2011
Right on. Thank you very much.

Here are our locale settings:
Code:
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=

What can I do to set "LC_ALL = C" at per command basises, without changing it system wide?

Also, even with the "LC_ALL = C" setting, would it still take 2^n longer time to grep n-character string case insensitively, or the length of the string would not matter that mach?
 

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LEARN ABOUT ULTRIX

locale.conf

LOCALE.CONF(5)                                                      locale.conf                                                     LOCALE.CONF(5)

NAME

       locale.conf - Configuration file for locale settings

SYNOPSIS

       /etc/locale.conf

DESCRIPTION

       The /etc/locale.conf file configures system-wide locale settings. It is read at early boot by systemd(1).

       The basic file format of locale.conf is a newline-separated list of environment-like shell-compatible variable assignments. It is possible
       to source the configuration from shell scripts, however, beyond mere variable assignments, no shell features are supported, allowing
       applications to read the file without implementing a shell compatible execution engine.

       Note that the kernel command line options locale.LANG=, locale.LANGUAGE=, locale.LC_CTYPE=, locale.LC_NUMERIC=, locale.LC_TIME=,
       locale.LC_COLLATE=, locale.LC_MONETARY=, locale.LC_MESSAGES=, locale.LC_PAPER=, locale.LC_NAME=, locale.LC_ADDRESS=, locale.LC_TELEPHONE=,
       locale.LC_MEASUREMENT=, locale.LC_IDENTIFICATION= may be used to override the locale settings at boot.

       The locale settings configured in /etc/locale.conf are system-wide and are inherited by every service or user, unless overridden or unset
       by individual programs or individual users.

       Depending on the operating system, other configuration files might be checked for locale configuration as well, however only as fallback.

       /etc/vconsole.conf is usually created and updated using systemd-localed.service(8).  localectl(1) may be used to alter the settings in this
       file during runtime from the command line. Use systemd-firstboot(1) to initialize them on mounted (but not booted) system images.

OPTIONS

       The following locale settings may be set using /etc/locale.conf: LANG=, LANGUAGE=, LC_CTYPE=, LC_NUMERIC=, LC_TIME=, LC_COLLATE=,
       LC_MONETARY=, LC_MESSAGES=, LC_PAPER=, LC_NAME=, LC_ADDRESS=, LC_TELEPHONE=, LC_MEASUREMENT=, LC_IDENTIFICATION=. Note that LC_ALL may not
       be configured in this file. For details about the meaning and semantics of these settings, refer to locale(7).

EXAMPLE

       Example 1. German locale with English messages

       /etc/locale.conf:

           LANG=de_DE.UTF-8
           LC_MESSAGES=en_US.UTF-8

SEE ALSO

       systemd(1), locale(7), localectl(1), systemd-localed.service(8), systemd-firstboot(1)

systemd 237                                                                                                                         LOCALE.CONF(5)
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