An exercise on the sed of the Three Musketeers of Linux

1.1 Take out the 908 of the A.txt in these three numbers:

Instance:

[email protected] tmp]# cat a.txt

Aaaaaaaaaaaaa

BBBB BBBBBBBBBBBBBB

I am ZJC 1046 (in) 908 jiayou

[Email protected] tmp]#

The result is:

[email protected] tmp]# cat A.txt

Aaaaaaaaaaaaa

BBBB BBBBBBBBBBBBBB

I am ZJC 1046 (in)908 jiayou

[Email protected] tmp]#

[[Email protected] tmp]# sed ' 3s#^.*88) \ ([0-9].*\] jia.*$#\1#g ' a.txt|sed-n ' 3p '

908

[Email protected] tmp]#

Operation process (for reference only):

[email protected] tmp]# cat A.txt

Aaaaaaaaaaaaa

BBBB BBBBBBBBBBBBBB

I am ZJC 1046 (in) 908 jiayou

[[Email protected] tmp]# sed ' 3p ' a.txt forgot to add parameter-N to cancel default output

Aaaaaaaaaaaaa

BBBB BBBBBBBBBBBBBB

I am ZJC 1046 (in) 908 jiayou

I am ZJC 1046 (in) 908 jiayou

[[email protected] tmp]# sed-n ' 3p ' a.txt add parameters to restore normal output only matching content

I am ZJC 1046 (in) 908 jiayou

[[email protected] tmp]# sed-n ' 3s#^.*88) \ (. *) JIA.*$#\1#GP ' a.txt escape multibyte wrong

Sed:-E expression #1, char 27:unmatched (or \ (

[[Email protected] tmp]# sed ' 3s#^.*88) \ (. *) jia.*$#\1#g ' a.txt escaped multibyte or not

Sed:-E expression #1, char 26:unmatched (or \ (

[[Email protected] tmp]# sed ' 3s#^.*88) \ (. *\) jia.*$#\1#g ' a.txt escape character is correct after normal

Aaaaaaaaaaaaa

BBBB bbbbbbbbbbbbbb but found that the default output is output by default because there is no add-n?

908

[[email protected] tmp]# sed-n ' 3s#^.*88) \ (. *\) jia.*$#\1#g ' a.txt added-n No content

[[email protected] tmp]# sed-n ' 3s#^.*88) \ ([0-9].*\] jia.*$#\1#g ' a.txt haven't found the reason

[[Email protected] tmp]# sed ' 3s#^.*88] \ ([0-9].*\) jia.*$#\1#g ' a.txt haven't found a reason

Aaaaaaaaaaaaa

BBBB BBBBBBBBBBBBBB haven't found a reason yet .

908

[[Email protected] tmp]# sed ' 3s#^.*88] \ ([0-9].*\) jia.*$#\1#g ' a.txt haven't found a reason

Aaaaaaaaaaaaa

BBBB BBBBBBBBBBBBBB

908

[[Email protected] tmp]# sed ' s#^.*88] \ ([0-9].*\) jia.*$#\1#g ' a.txt haven't found a reason

Aaaaaaaaaaaaa

BBBB BBBBBBBBBBBBBB

908

[[Email protected] tmp]# sed ' 3s#^.*88] \ ([0-9].*\) jia.*$#\1#g ' a.txt haven't found a reason

Aaaaaaaaaaaaa

BBBB BBBBBBBBBBBBBB

908

[[email protected] tmp]# sed-n ' 3s#^.*88) \ ([0-9].*\] jia.*$#\1#g ' a.txt still think it is-n

[Email protected] tmp]#

[[email protected] tmp]# sed-nr ' 3s#^.*88) \ ([0-9].*\] jia.*$#\1#g ' a.txt is not add-r?

Sed:-E expression #1, char 32:unmatched) or \)

[[email protected] tmp]# sed-n ' 3s#^.*88) \ ([0-9].*\] jia.*$#\1#g ' a.txt haven't found the reason

[[email protected] tmp]# sed-n ' 3s#^.*88) \ ([0-9].*\] jia.*$#\1#g ' A.txt|xargs ls

I haven't found a reason.

A.txt P.txt Test.txt

[[email protected] tmp]# sed-n ' 3s#^.*88) \ ([0-9].*\] jia.*$#\1#g ' A.txt|xargs cat

I haven't found a reason.

[[email protected] tmp]# sed-n ' 3s#^.*88) \ ([0-9].*\] jia.*$#\1#g ' a.txt

I haven't found a reason.

[[Email protected] tmp]# sed ' 3s#^.*88] \ ([0-9].*\) jia.*$#\1#g ' a.txt haven't found a reason

Aaaaaaaaaaaaa

BBBB BBBBBBBBBBBBBB

908

[[Email protected] tmp]# sed ' 3s#^.*88) \ ([0-9].*\] jia.*$#\1#g ' a.txt|sed ' 3p '

Plus one sed.

Aaaaaaaaaaaaa

BBBB BBBBBBBBBBBBBB

908

908

[[Email protected] tmp]# sed ' 3s#^.*88) \ ([0-9].*\] jia.*$#\1#g ' a.txt|sed-n ' 3p '

Cancel default Output

908

[email protected] tmp]# cat A.txt

Aaaaaaaaaaaaa

BBBB BBBBBBBBBBBBBB

I am ZJC 1046 (in) 908 jiayou

[Email protected] tmp]#

[[Email protected] tmp]# sed ' 3s#^.*88) \ ([0-9].*\) jia.*$#\1#gp ' A.txt Oh, I forgot to add P

Aaaaaaaaaaaaa

BBBB BBBBBBBBBBBBBB

908

908

[[email protected] tmp]# sed-n ' 3s#^.*88) \ ([0-9].*\] jia.*$#\1#gp ' a.txt Add a-N to o

908

[Email protected] tmp]#

This article is from the "[email protected]" blog, please be sure to keep this source http://jinchengzheng.blog.51cto.com/10798482/1843245

An exercise on the sed of the Three Musketeers of Linux