Examples of using SED file processing tools in Linux

Sed is a good file processing tool, itself is a pipe command, mainly in the behavior of the unit, you can replace, delete, add, select and other specific work.

Grammar

sed [-options] ' command ' filename
Options

-N: Use Quiet (silent) mode. In general sed usage, all data from stdin is generally listed on the screen. However, if you add the-n parameter, only the line (or action) that is specifically handled by SED will be listed.

-E: SED action edit directly on instruction column mode;

-F: Directly write the action of SED in a file, the-f filename can perform the SED action in filename;

-r:sed's actions support the syntax of extended formal notation. (Presupposition is the basic formal representation of French law)

-I: Directly modify the contents of the file read, not by the screen output.

Command

A: New, a can be followed by a string, and these strings will appear on the new line (the current line) ~

C: Replace, C can be followed by strings, these strings can replace the line between N1,N2!

D: Delete, because it is deleted ah, so d usually do not pick up any of the drums;

I: Insert, I can be followed by strings, and these strings will appear on a new line (the current line);

P: Print, that is, to print out a selection of data. Normally p will work with the parameter Sed-n ~

S: Replace and can be directly substituted for work miles! Usually this s action can be paired with formal notation! For example, 1,20s/old/new/g is!
Working with instances

Delete a row

# sed ' 1d ' ab #删除第一行
# sed ' $d ' ab #删除最后一行
# sed ' 1,2d ' ab #删除第一行到第二行
# sed ' 2, $d ' AB #删除第二行到最后一行

Print a line

# sed-n ' 1p ' ab #显示第一行
# sed-n ' $p ' ab #显示最后一行
# sed-n ' 1,2p ' ab #显示第一行到第二行
# sed-n ' 2, $p ' AB #显示第二行到最后一行

Using patterns for querying

# sed-n '/ruby/p ' ab #查询包括关键字ruby所在所有行
# sed-n '/\$/p ' AB #查询包括关键字 $ all row, using backslash \ Mask Special meaning

Add one or more lines of string

# sed ' 1a drink tea ' ab #第一行后增加字符串 "Drink Tea"
# sed ' 1,3a drink tea ' ab #第一行到第三行后增加字符串 "Drink Tea"
# sed ' 1a drink tea\nor coffee ' ab #第一行后增加多行, using line breaks \ n

Replace one or more lines

# sed ' 1c Hi ' AB #第一行代替为Hi
# sed ' 1,2c Hi ' ab #第一行到第二行代替为Hi

Replace a part of a row

# sed-n '/ruby/p ' ab | Sed ' s/ruby/bird/g ' #替换ruby为bird
# sed-n '/ruby/p ' ab | Sed ' s/ruby//g ' #删除ruby

Insert

# sed-i ' $a bye ' ab #在文件ab中最后一行直接输入 ' bye '

Delete a matching row

Sed-i '/ruby/d ' filename #删除带有ruby的行

All right, that's it. The cloud Habitat Community small partners for you to organize on the Linux sed command on the file operation of some methods.