Linux基础-sed+正则表达式

朴灿烈づ我的快乐病毒、 2022-05-26 06:52 232阅读 0赞

1，删除文件每行的第一个字符：sed -r 's/^.//g' passwd

![1122946-20170322151140283-1649496332.png][]

2，删除文件每行的第二个字符:sed -r 's/^(.)(.)/\\1/g' passwd

![1122946-20170322151305299-1361991533.png][]

3，删除文件每行的最后一个字符:sed -r 's/(.)$//g'

![1122946-20170322151451268-1930911052.png][]

4，删除文件每行的倒数第二个字符: sed -r 's/(.)(.)$/\\2/g' passwd

![1122946-20170322152454346-543429477.png][]

5，删除文件每行的第二个单词:sed -r 's/^(\[a-Z\])(\[^0-9\]\[^a-Z\])(a-Z)/\\1\\2/g' passwd

![1122946-20170322152833549-1321678066.png][]

6，删除文件每行的倒数第二个单词:

sed -r 's/(\[a-Z\]+)(\[^0-9\]\[^a-Z\])(\[a-Z\]+)$/\\2\\3/g' passwd

![1122946-20170322153514268-957541647.png][]

7，删除文件每行的最后一个单词: sed -r 's/(\[a-Z\]+)$' passwd

![1122946-20170322153651486-1239937940.png][]

8，交换每行的第一个字符和第二个字符:sed -r 's/^(.)(.)/\\2\\1/g' passwd

![1122946-20170322161759424-1710647668.png][]

9，交换每行的第一个字符和第二个单词:

sed -r 's/^(.)(\[a-Z\]+)(\[^0-9\]\[^a-Z\]+)(\[a-Z\]+)(\[^0-9\]\[a-Z\])/\\4\\2\\3\\1\\5/g' passwd

![1122946-20170322162004565-1036404888.png][]

10，交换每行的第一个单词和最后一个单词:

sed -r 's/^(\[a-Z0-9\]+)(\[^a-Z0-9\]+)(.+)(\[^a-Z0-9\]+)(\[a-Z0-9\]+)/\\5\\2\\3\\4\\1/g' passwd

![1122946-20170322165314299-1712278626.png][]

11，删除一个文件中所有的数字：sed -r 's/\[0-9\]//g' passwd

![1122946-20170322165655565-974493989.png][]

12，删除每行开头的所有空格:sed -r 's/^ //g' passwd

![1122946-20170322170329846-1755168494.png][]

13，用制表符替换文件中出现的所有空格。

![1122946-20170322170728908-2128196928.png][]

14，把所有大写字母用括号（）括起来： sed -r 's/\[A-Z\]/(&)/g' passwd

![1122946-20170322171721690-478792619.png][]

15，打印每行3次：sed 'p;p' passwd 每一个p代表一次打印，如果没有p则打印一遍，之后没多一个p就会多一次打印

![1122946-20170322172908877-885368973.png][]

16，只显示每行的第一个单词：sed -r 's/(\[^0-9a-Z\]+)(.+)//g' passwd

![1122946-20170322173159783-908488323.png][]

17，打印每行的第一个单词和第三个单词

![1122946-20170322183407799-1669413656.png][]

18，用命令获取格式为 mm/yy/dd 的日期格式，结合管道，将其换成   mm；yy；dd格式

date "+%m/%y/%d" | sed -r 's/\\/\\-/g'

![1122946-20170322184639361-753051343.png][]

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