locale 对字符排序的影响

引用:

-(user@host:tty)-(tmp)-
[361 0] % echo "aA" | grep '[A-Z]$'
aA
-(user@host:tty)-(tmp)-
[361 0] % echo "aA" | grep '[a-z]$'
-(user@host:tty)-(tmp)-
[361 1] % echo "aA" | grep '[[:upper:]]$'
aA
-(user@host:tty)-(tmp)-
[361 0] % echo "aA" | grep '[[:lower:]]$'
-(user@host:tty)-(tmp)-
[361 1] % bash --version
GNU bash, version 3.00.16(5)-release (powerpc-apple-darwin7.7.0)
Copyright (C) 2004 Free Software Foundation, Inc.
-(user@host:tty)-(tmp)-
[361 0] % uname -a
Darwin apple.local 8.2.0 Darwin Kernel Version 8.2.0: Fri Jun 24 17:46:54 PDT 2005; root:xnu-792.2.4.obj~3/RELEASE_PPC Power Macintosh powerpc
-(user@host:tty)-(tmp)-
[361 0] % grep -V
grep (GNU grep) 2.5.1

Copyright 1988, 1992-1999, 2000, 2001 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

-(user@host:tty)-(tmp)-
[361 0] %

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引用:

-(user@host:tty)-(tmp)-
[3836 0] $ man grep
......

REGULAR EXPRESSIONS
    ......

    Within a bracket expression, a range expression consists of two charac-
    ters separated by a hyphen.  It matches any single character that sorts
    between the two characters, inclusive,  using  the  locale's  collating
    sequence  and  character  set.   For  example, in the default C locale,
    [a-d] is equivalent to [abcd].  Many locales sort characters in dictio-
    nary  order,  and in these locales [a-d] is typically not equivalent to
    [abcd]; it might be equivalent to [aBbCcDd], for  example.   To  obtain
    the  traditional interpretation of bracket expressions, you can use the
    C locale by setting the LC_ALL environment variable to the value C.
......

-(user@host:tty)-(tmp)-
[3836 0] $ cat file
a
A
z
Z
-(user@host:tty)-(tmp)-
[3836 0] $ LC_ALL=en_US.UTF-8 grep [a-z] file
a
A
z
-(user@host:tty)-(tmp)-
[3836 0] $ LC_ALL=en_US.UTF-8 grep [A-Z] file
A
z
Z
-(user@host:tty)-(tmp)-
[3836 0] $ LC_ALL=C grep [a-z] file
a
z
-(user@host:tty)-(tmp)-
[3836 0] $ LC_ALL=C grep [A-Z] file
A
Z
-(user@host:tty)-(tmp)-
[3836 0] $ LC_ALL=en_US.UTF-8 sort file
a
A
z
Z
-(user@host:tty)-(tmp)-
[3836 0] $ LC_ALL=C sort file
A
Z
a
z
-(user@host:tty)-(tmp)-
[3836 0] $

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