sed 與正規表示式組合應用（一）

sed 與正規表示式組合格式

sed 『/正規表示式/sed命令『

1、區分大小寫

$ echo "this is a test" |sed -n '/this/p'

$ echo "this is a test" |sed -n '/this/p'

this is a test

2、模式匹配的文字要大於或等於 表示式集合

$ echo "the books are expensive" | sed -n '/book/p'

the books are expensive

$ echo "the book are expensive" | sed -n '/books/p'

$ echo "the books are expensive" | sed -n '/book/p'

the books are expensive

$ echo "this is line number 1" | sed -n '/number 1/p'

this is line number 1

3、識別空格

$ cat >data1

this is a normal line of text.

this  is  a  line  with   too    many      spaces.

$ sed -n '/   /p' data1

this  is  a  line  with   too    many      spaces.

4、支援定位符^ $

$ echo "the book store" | sed -n '/^book/p'

$ echo "book store" | sed -n '/^book/p'

book store

$ echo "this ^ is a test" | sed -n '/s ^/p'

this ^ is a test

$ cat data4

this is a test of using both anchors

i said this is a test

this is a test

i'm sure this is a test

$ sed -n '/^$/d' data4

$ sed  '/^$/d' data4

this is a test of using both anchors

i said this is a test

this is a test

i'm sure this is a test

5、支援. 字元代替任何字元

$ cat >data6

this is a test of a line

the cat is sleeping.

that is a very nice cat.

this test is at line four.

at ten o'clock we'll go home.

$ sed -n '/.at/p' data6

the cat is sleeping.

that is a very nice cat.

this test is at line four.

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