linux sort按照指定列排序

sort怎样按指定的列排序
0000 27189 41925425
065f 15 41925425
0663 7 41925425
0675 5 41925425
0691 76 41925425
0693 2 41925425
06a7 82 41925425
06a9 58 41925425
06bf 68 41925425
06c1 56 41925425
06d7 145 41925425
06e1 127 41925425
06e3 230 41925425
06e5 7 41925425
06ef 48 41925425
06f1 463 41925425
06ff 3847 41925425
070b 2376 41925425
070d 3408 41925425
0713 109025 41925425
0715 4 41925425
0726 134 41925425
我想按第二列值进行排序，从大到小的顺序。
看了下man,还是不大明确，还请大家指点一二。

答案：sort -n -k2 file.txt 或则sort -g -k2 file.txt(从小到大排序)
-n, --numeric-sort
-g, --general-numeric-sort
sort -rn -k2 all_contig.txt （加-r从大到小排序）

使用方法：sort [选项]... [文件]...
Write sorted concatenation of all FILE(s) to standard output.

长选项必须用的參数在使用短选项时也是必须的。
顺序选项：

-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 显示此帮助信息并退出
--version 输出版本号信息并退出

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.

请向 <bug-coreutils@gnu.org> 报告错误。