sort
sort 命令对 File 参数指定的文件中的行排序，并将结果写到标准输出。如果 File 参数指定多个文件，那么 sort 命令将这些文件连接起来，并当作一个文件进行排序。
sort语法
[root@www ~]# sort [-fbMnrtuk] [file or stdin]
选项与参数：
-f ：忽略大小写的差异，例如 A 与 a 视为编码相同；
-b ：忽略最前面的空格符部分；
-M ：以月份的名字来排序，例如 JAN, DEC 等等的排序方法；
-n ：使用『纯数字』进行排序(默认是以文字型态来排序的)；
-r ：反向排序；
-u ：就是 uniq ，相同的数据中，仅出现一行代表；
-t ：分隔符，默认是用 [tab] 键来分隔；
-k ：以那个区间 (field) 来进行排序的意思
对/etc/passwd 的账号进行排序
[root@www ~]# cat /etc/passwd | sort
adm:x:3:4:adm:/var/adm:/sbin/nologin
apache:x:48:48:Apache:/var/www:/sbin/nologin
bin:x:1:1:bin:/bin:/sbin/nologin
daemon:x:2:2:daemon:/sbin:/sbin/nologin
sort 是默认以第一个数据来排序，而且默认是以字符串形式来排序,所以由字母 a 开始升序排序。
/etc/passwd 内容是以 : 来分隔的，我想以第三栏来排序，该如何
[root@www ~]# cat /etc/passwd | sort -t ':' -k 3
root:x:0:0:root:/root:/bin/bash
uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin
operator:x:11:0:operator:/root:/sbin/nologin
bin:x:1:1:bin:/bin:/sbin/nologin
games:x:12:100:games:/usr/games:/sbin/nologin
默认是以字符串来排序的，如果想要使用数字排序：
cat /etc/passwd | sort -t ':' -k 3n
root:x:0:0:root:/root:/bin/bash
daemon:x:1:1:daemon:/usr/sbin:/bin/sh
bin:x:2:2:bin:/bin:/bin/sh
默认是升序排序，如果要倒序排序，如下
cat /etc/passwd | sort -t ':' -k 3nr
nobody:x:65534:65534:nobody:/nonexistent:/bin/sh
ntp:x:106:113::/home/ntp:/bin/false
messagebus:x:105:109::/var/run/dbus:/bin/false
sshd:x:104:65534::/var/run/sshd:/usr/sbin/nologin
如果要对/etc/passwd,先以第六个域的第2个字符到第4个字符进行正向排序，再基于第一个域进行反向排序。
cat /etc/passwd | sort -t':' -k 6.2,6.4 -k 1r
sync:x:4:65534:sync:/bin:/bin/sync
proxy:x:13:13:proxy:/bin:/bin/sh
bin:x:2:2:bin:/bin:/bin/sh
sys:x:3:3:sys:/dev:/bin/sh
查看/etc/passwd有多少个shell:对/etc/passwd的第七个域进行排序，然后去重:
cat /etc/passwd | sort -t':' -k 7 -u
root:x:0:0:root:/root:/bin/bash
syslog:x:101:102::/home/syslog:/bin/false
daemon:x:1:1:daemon:/usr/sbin:/bin/sh
sync:x:4:65534:sync:/bin:/bin/sync
sshd:x:104:65534::/var/run/sshd:/usr/sbin/nologin
uniq
uniq命令可以去除排序过的文件中的重复行，因此uniq经常和sort合用。也就是说，为了使uniq起作用，所有的重复行必须是相邻的。
uniq语法
[root@www ~]# uniq [-icu]
选项与参数：
-i ：忽略大小写字符的不同；
-c ：进行计数
-u ：只显示唯一的行
testfile的内容如下
cat testfile
hello
world
friend
hello
world
hello
直接删除未经排序的文件，将会发现没有任何行被删除
#uniq testfile
hello
world
friend
hello
world
hello
排序文件，默认是去重
#cat words | sort |uniq
friend
hello
world
排序之后删除了重复行，同时在行首位置输出该行重复的次数
#sort testfile | uniq -c
1 friend
3 hello
2 world
仅显示存在重复的行，并在行首显示该行重复的次数
#sort testfile | uniq -dc
3 hello
2 world
仅显示不重复的行
sort testfile | uniq -u
friend
cut
cut命令可以从一个文本文件或者文本流中提取文本列。
cut语法
[root@www ~]# cut -d'分隔字符' -f fields <==用于有特定分隔字符
[root@www ~]# cut -c 字符区间 <==用于排列整齐的信息
选项与参数：
-d ：后面接分隔字符。与 -f 一起使用；
-f ：依据 -d 的分隔字符将一段信息分割成为数段，用 -f 取出第几段的意思；
-c ：以字符 (characters) 的单位取出固定字符区间；
PATH 变量如下
[root@www ~]# echo $PATH
/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/X11R6/bin:/usr/games
# 1 | 2 | 3 | 4 | 5 | 6 |
将 PATH 变量取出，我要找出第五个路径。
#echo $PATH | cut -d ':' -f 5
/usr/local/bin
将 PATH 变量取出，我要找出第三和第五个路径。
#echo $PATH | cut -d ':' -f 3,5
/sbin:/usr/local/bin
将 PATH 变量取出，我要找出第三到最后一个路径。
echo $PATH | cut -d ':' -f 3-
/sbin:/usr/sbin:/usr/local/bin:/usr/X11R6/bin:/usr/games
将 PATH 变量取出，我要找出第一到第三个路径。
#echo $PATH | cut -d ':' -f 1-3
/bin:/usr/bin:/sbin:
将 PATH 变量取出，我要找出第一到第三，还有第五个路径。
echo $PATH | cut -d ':' -f 1-3,5
/bin:/usr/bin:/sbin:/usr/local/bin
实用例子:只显示/etc/passwd的用户和shell
#cat /etc/passwd | cut -d ':' -f 1,7
root:/bin/bash
daemon:/bin/sh
bin:/bin/sh
wc
统计文件里面有多少单词，多少行，多少字符。
wc语法
[root@www ~]# wc [-lwm]
选项与参数：
-l ：仅列出行；
-w ：仅列出多少字(英文单字)；
-m ：多少字符；
默认使用wc统计/etc/passwd
#wc /etc/passwd
40 45 1719 /etc/passwd
40是行数，45是单词数，1719是字节数
wc的命令比较简单使用，每个参数使用如下：
#wc -l /etc/passwd #统计行数，在对记录数时，很常用
40 /etc/passwd #表示系统有40个账户 #wc -w /etc/passwd #统计单词出现次数
45 /etc/passwd #wc -m /etc/passwd #统计文件的字节数
转:http://www.cnblogs.com/ggjucheng/archive/2013/01/13/2858385.html
根据上面一些命令做一些日志分析
提取日志里面关键参数：
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" 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统计每天日志里面IP访问数量
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