[Zz] usage of sed in Linux

Sed is a good file processing tool. It is a pipeline command mainly used for processing by behavior units. It can replace, delete, add, and select data rows, next, let's take a look at the usage of sed.
Sed command line format:
Sed [-nefri] 'command' input text

Common options:
-N: Use silent mode. In general sed usage, all information from stdin is usually listed on the screen. However, if the-n parameter is added, only the row (or action) that has been specially processed by SED will be listed.
-E: directly edit the SED action in the Command column mode;
-F: Write the SED action directly in a file.-f filename can execute the SED action in filename;
-R: sed supports the syntax of extended regular notation. (The default is the basic regular expression syntax)
-I: directly modify the content of the file to be read, rather than output by the screen.

Common commands:
A: new. A can be followed by strings. These strings will appear in a new row (the next row currently )~
C: replace. C can be followed by strings. These strings can replace rows between N1 and N2!
D: delete. Because it is deleted, D is usually not followed by any comment;
I: insert, I can be followed by strings, and these strings will appear in the new line (the previous line currently );
P: print the selected data. Usually P will work with the sed-N parameter ~
S: replace, you can directly replace the work! Generally, this s action can be combined with regular notation! For example, 1, 20 s/old/new/g!

Example: (assume we have a file named AB)
Delete a row
[Root @ localhost Ruby] # sed '1d 'AB # Delete the first line
[Root @ localhost Ruby] # sed '$ d' AB # Delete the last row
[Root @ localhost Ruby] # sed '1, 2D 'AB # Delete rows 1 to 2
[Root @ localhost Ruby] # sed '2, $ d' AB # Delete the second row to the last row

Show a row
. [Root @ localhost Ruby] # sed-N '1p' AB # display the first line
[Root @ localhost Ruby] # sed-n' $ P' AB # display the last line
[Root @ localhost Ruby] # sed-n'1, 2 p 'AB # display the first row to the second row
[Root @ localhost Ruby] # sed-n' 2, $ P' AB # display the second row to the last row

Use mode for query
[Root @ localhost Ruby] # sed-n'/Ruby/P' AB # query all rows including the keyword Ruby
[Root @ localhost Ruby] # sed-n'/\ $/P' AB # query all rows with the keyword $. Use backslash \ To block special meanings.

Add one or more strings
[Root @ localhost Ruby] # Cat AB
Hello!
Ruby is me, welcome to my blog.
End
[Root @ localhost Ruby] # sed '1a drink tea 'AB # Add the string "drink tea" after the first line"
Hello!
Drink tea
Ruby is me, welcome to my blog.
End
[Root @ localhost Ruby] # sed '1, 3A drink tea 'AB # Add the string "drink tea" between the first row and the third row"
Hello!
Drink tea
Ruby is me, welcome to my blog.
Drink tea
End
Drink tea
[Root @ localhost Ruby] # sed '1a drink tea \ nor coffee 'AB # add multiple lines after the first line and use the line break \ n
Hello!
Drink tea
Or coffee
Ruby is me, welcome to my blog.
End

Replace one or more rows
[Root @ localhost Ruby] # sed '1c Hi' AB # Replace the first line with hi
Hi
Ruby is me, welcome to my blog.
End
[Root @ localhost Ruby] # sed '1, 2c Hi' AB # Replace the first and second rows with hi
Hi
End

Replace a part of a row
Format: SED's/string to be replaced/New String/G' (the string to be replaced can use a regular expression)
[Root @ localhost Ruby] # sed-n'/Ruby/P' AB | SED's/Ruby/bird/G' # Replace Ruby with bird
[Root @ localhost Ruby] # sed-n'/Ruby/P' AB | SED's/Ruby // G' # Delete Ruby

Insert
[Root @ localhost Ruby] # sed-I '$ A Bye' AB # Enter "bye" in the last line of file AB"
[Root @ localhost Ruby] # Cat AB
Hello!
Ruby is me, welcome to my blog.
End
Bye

From: http://www.cnblogs.com/dong008259/archive/2011/12/07/2279897.html