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sed -i command Detailed

[root @ www ~] # sed [-nefr] [ action] 
options and parameters: 
-n: Use quiet (silent) mode. Sed in general usage, all data from STDIN generally will be listed to the terminal. However, if after adding -n parameter, only through the line sed special treatment (or action) will be listed. 
-e: directly on the command-line mode of action sed editor; 
-f: sed directly to the action in a written document, -f filename you can run sed action in the filename; 
-r: sed action is supported regular expression syntax of the extension type. (The default is the basis of regular expression French and France) 
-i: directly modify the contents of the file to read instead of output to the terminal. 

Action Description: [N1 [, n2]] function 
N1, n2: not necessarily exist, usually on behalf of "the number of rows selected for action", for example, if my action is needed between 10-20 rows , the "10, 20 [action behavior]" 

function: 
a: new, can take back a string, and those strings come in a new line (currently the next line) ~ 
c: to replace, c behind can take a string, these strings can be substituted n1, N2 between the line! 
d: Delete, because it is deleted ah, so the back are not normally connected to any pound d; 
i: insert, i can take back the string, which string appears (the line current) is a new line; 
P: Print, that will print a selection of data. P will usually run together with the parameters sed -n ~
s: replace, the work can be substituted directly miles! Usually this s action can be used with regular expression! For example 1,20s / old / new / g is it!

sed -i is a text file directly operate

sed -i 's / original string / new string /' /home/1.txt 
sed -i 's / original string / new string / g' /home/1.txt

The difference between these two commands is to see an example of it

This is the content of 1.txt

#cat 1.txt
d
ddd
#ff

Look at the difference between these two commands execute it

sed -i 's / d / 7523 /' /home/1.txt 
execution result 
7523 
7523dd 
#FF 

Sed -i 'S / D / 7523 / G' /home/1.txt 
execution result 
7523 
752 375 237 523 
#FF

Remove the "first line" with "@" @ initials

sed -i 's/^@//' file

Insert a new line character string preceding the particular

sed -i '/ specific string / i newline character string' file

After a particular row insert a new line character string

sed -i '/ specific string / a newline character string' file

To delete a specific string

sed -i '/ string / d' file

sed -i "s\\"""\\\\g" tmp

[root @ www ~] # sed [-nefr] [ action] 
options and parameters: 
-n: Use quiet (silent) mode. Sed in general usage, all data from STDIN generally will be listed to the terminal. However, if after adding -n parameter, only through the line sed special treatment (or action) will be listed. 
-e: directly on the command-line mode of action sed editor; 
-f: sed directly to the action in a written document, -f filename you can run sed action in the filename; 
-r: sed action is supported regular expression syntax of the extension type. (The default is the basis of regular expression French and France) 
-i: directly modify the contents of the file to read instead of output to the terminal. 

Action Description: [N1 [, n2]] function 
N1, n2: not necessarily exist, usually on behalf of "the number of rows selected for action", for example, if my action is needed between 10-20 rows , the "10, 20 [action behavior]" 

function: 
a: new, can take back a string, and those strings come in a new line (currently the next line) ~ 
c: to replace, c behind can take a string, these strings can be substituted n1, N2 between the line! 
d: Delete, because it is deleted ah, so the back are not normally connected to any pound d; 
i: insert, i can take back the string, which string appears (the line current) is a new line;  
P: Print, that will print a selection of data. P will usually run together with the parameters sed -n ~
S: replace, the work can be directly substituted miles! Usually this s action can be used with regular expression! For example 1,20s / old / new / g is it!