The Linux shell sed

The SED editor processes the input line by row, and then sends the results to the screen.

-i option: Direct Action source file, source file will be modified.

sed commands and options:

A\	Add one or more rows after the current line
C\	Replace text in the current line with new text
D	Delete Row
I\	Insert text before the current line
H	Copy the contents of the schema space to the staging buffer
H	Add the contents of the schema space to the buffer
G	Remove the contents of the staging buffer and copy it to the pattern buffer
G	Remove the contents of the staging buffer and append it to the pattern buffer
L	List non-printable characters
P	Print Line
N	Reads the next line of input and processes it from the next rather than the first command
Q	End or exit sed
R	Reading input rows from a file
!	Apply all commands to a row other than the selected row
S	Replace another string with one string

Replace flag:

G	Global substitution within a row
P	Print Line
W	Writing rows to a file
X	Swapping the contents of a staging buffer and pattern space
Y	Convert a character to another character

Examples of sed:

Print: P command

Sed '/abc/p ' file	Prints the line containing ABC in file. By default, sed prints all rows to the screen, and if a row matches the pattern, print the line again
Sed-n '/abc/p ' file	Just like above, only the default behavior of SED is removed, and only matching rows are printed

Delete: D command

Sed ' 3, $d ' file	Deletes the contents from line 3rd to the last row.
Sed ' $d ' file	Delete the contents of the last row
Sed '/abc/d '	Delete the line that contains the ABC.
Sed ' 3d ' file	Delete the contents of the third row

Replace: s command

Sed ' s/abc/def/g ' file	Replace all ABC in the line with Def, and if there is no G, replace only the first ABC in the row
Sed-n ' s/abc/def/p ' file	Print only those rows where the substitution occurred
Sed ' s/abc/&def/' file	Add Def (& to match content) behind all ABC
Sed-n ' s/abc/def/gp ' file	Replace all ABC with DEF and print the lines where the substitution occurred
Sed ' s#abc#def#g ' file	Replace all ABC with DEF, followed by the character behind S to find the string and Replace the split character between the strings, in this case try #

Specify the range of rows: comma

Sed-n '/abc/,/def/p ' file	Print mode ABC to DEF line
Sed-n ' 5/,/def/p ' file	Prints the line from line fifth to the containing Def line.
sed/abd/,/def/s/aaa/bbb/g	Modify the line between pattern ABC and mode DEF to replace AAA with Def

Multiple edits-E

Sed-e ' 1,3d '-e ' s/abc/def/g ' file

Delete 1-3 lines and replace the remaining lines of ABC with DEF

Read file: R command

Sed '/abc/r newfile ' file

Read the contents of the NewFile after the line containing ABC

Write file: w command

Sed '/abc/w newfile ' file

Write newfile on lines that contain ABC

Append: a command

Sed '/abc/a\def ' file

A new line after the line containing ABC, written to Def

insert: I command

Sed '/abc/i\def ' file

A new line before the line containing ABC, written to Def

Modify: C command

Sed '/abc/c\def ' file

Replace the line containing ABC with DEF and the old text is overwritten

Read Next line: N command

Sed '/abc/{n; s/aaa/bbb/g;} ' file

Reads the next line of lines containing ABC, replacing AAA for BBB

convert: Y command

Sed ' y/abc/abc ' file

Replace A with a, a, a, a, or a b,c with a C (regular expression metacharacters do not work)

exit: Q command

Sed '/abc/{s/aaa/bbb/; q;} ' file

Include ABC in a line, replace AAA with BBB, and then exit sed.

Staging and fetching: H Command (store pattern rows to staging buffer) and g (remove row from staging buffer and overwrite pattern buffer) g (row to remove temporary buffer) command

H and G are replication behaviors (Overrides), and H and G represent append.

Sed-e '/abc/h '-e ' $G ' file	Rows containing ABC are saved to the staging buffer by the H command, and in the second command sink, when Sed reads the last line of $, the G command reads a row from the staging buffer, appended to the pattern buffer. That is, the last line of all lines that contain ABC is copied to the end of the file.
Sed-e '/abc/{h; D;} ' -E '/def/{g;} ' file	Rows containing the ABC are moved to the line containing Def and overwritten.

Staging and interchange: H and X Commands

Sed-e '/abc/h ' -E '/def/x ' file

Contains

The Linux shell sed