The Linux shell sed

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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
Lines that contain ABC are converted to def rows.

The Linux shell sed

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