不变应万变-sort命令

[oracle@localhost ~]$ man sort 

 SORT(1)                          User Commands                         SORT(1) 


 NAME 

        sort - sort lines of text files 


 SYNOPSIS 

        sort [OPTION]... [FILE]... 


 DESCRIPTION 

        Write sorted concatenation of all FILE(s) to standard output. 


        Mandatory arguments to long options are mandatory for short options too.  Ordering options: 


        -b, --ignore-leading-blanks 

               ignore leading blanks 


        -d, --dictionary-order 

               consider only blanks and alphanumeric characters 


        -f, --ignore-case 

               fold lower case to upper case characters 


        -g, --general-numeric-sort 

               compare according to general numerical value 


        -i, --ignore-nonprinting 

               consider only printable characters 


        -M, --month-sort 

               compare (unknown) < ‘JAN’ < ... < ‘DEC’ 


        -n, --numeric-sort 

               compare according to string numerical value 


        -r, --reverse 

               reverse the result of comparisons 


        Other options: 


        -c, --check 

               check whether input is sorted; do not sort 


        -k, --key=POS1[,POS2] 

               start a key at POS1, end it at POS2 (origin 1) 


        -m, --merge 

               merge already sorted files; do not sort 


        -o, --output=FILE 

               write result to FILE instead of standard output 


        -s, --stable 

               stabilize sort by disabling last-resort comparison 


        -S, --buffer-size=SIZE 

               use SIZE for main memory buffer 


        -t, --field-separator=SEP 

               use SEP instead of non-blank to blank transition 


        -T, --temporary-directory=DIR 

               use DIR for temporaries, not $TMPDIR or /tmp; multiple options specify multiple directories 


        -u, --unique 

               with -c, check for strict ordering; without -c, output only the first of an equal run 


        -z, --zero-terminated 

               end lines with 0 byte, not newline 


        --help display this help and exit 


        --version 

               output version information and exit 


        POS  is  F[.C][OPTS],  where F is the field number and C the character position in the field.  OPTS is 

        one or more single-letter ordering options, which override global ordering options for that  key.   If 

        no key is given, use the entire line as the key. 


        SIZE  may be followed by the following multiplicative suffixes: % 1% of memory, b 1, K 1024 (default), 

        and so on for M, G, T, P, E, Z, Y. 


        With no FILE, or when FILE is -, read standard input. 


        *** WARNING *** The locale specified by the environment affects sort order.  Set LC_ALL=C to  get  the 

        traditional sort order that uses native byte values. 


 AUTHOR 

        Written by Mike Haertel and Paul Eggert. 


 REPORTING BUGS 

        Report bugs to <[e-mail]>. 


 COPYRIGHT 

        Copyright ? 2006 Free Software Foundation, Inc. 

        This  is  free  software.  You may redistribute copies of it under the terms of the GNU General Public 

        License <http://www.gnu.org/licenses/gpl.html>.  There is NO WARRANTY, to the extent permitted by law. 


 SEE ALSO 

        The  full documentation for sort is maintained as a Texinfo manual.  If the info and sort programs are 

        properly installed at your site, the command 


               info sort 


        should give you access to the complete manual. 
sort 5.97                        February 2010                         SORT(1)

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
[oracle@localhost ~]$ sort --help
 Usage: sort [OPTION]... [FILE]...
 Write sorted concatenation of all FILE(s) to standard output.

 Mandatory arguments to long options are mandatory for short options too.
 Ordering options:

   -b, --ignore-leading-blanks  ignore leading blanks
   -d, --dictionary-order      consider only blanks and alphanumeric characters
   -f, --ignore-case           fold lower case to upper case characters
   -g, --general-numeric-sort  compare according to general numerical value
   -i, --ignore-nonprinting    consider only printable characters
   -M, --month-sort            compare (unknown) < `JAN' < ... < `DEC'
   -n, --numeric-sort          compare according to string numerical value
   -r, --reverse               reverse the result of comparisons

 Other options:

   -c, --check               check whether input is sorted; do not sort
   -k, --key=POS1[,POS2]     start a key at POS1, end it at POS2 (origin 1)
   -m, --merge               merge already sorted files; do not sort
   -o, --output=FILE         write result to FILE instead of standard output
   -s, --stable              stabilize sort by disabling last-resort comparison
   -S, --buffer-size=SIZE    use SIZE for main memory buffer
   -t, --field-separator=SEP  use SEP instead of non-blank to blank transition
   -T, --temporary-directory=DIR  use DIR for temporaries, not $TMPDIR or /tmp;
                               multiple options specify multiple directories
   -u, --unique              with -c, check for strict ordering;
                               without -c, output only the first of an equal run
   -z, --zero-terminated     end lines with 0 byte, not newline
       --help     display this help and exit
       --version  output version information and exit

 POS is F[.C][OPTS], where F is the field number and C the character position
 in the field.  OPTS is one or more single-letter ordering options, which
 override global ordering options for that key.  If no key is given, use the
 entire line as the key.

 SIZE may be followed by the following multiplicative suffixes:
 % 1% of memory, b 1, K 1024 (default), and so on for M, G, T, P, E, Z, Y.

 With no FILE, or when FILE is -, read standard input.

 *** WARNING ***
 The locale specified by the environment affects sort order.
 Set LC_ALL=C to get the traditional sort order that uses
 native byte values.

 Report bugs to <[e-mail]>.