How to use the SED command under UNIX

SED usage: sed ' Command ' filename (s) displays only results without modifying the file.

1, sed ' 2,5d ' file displays files, excluding 2-5 rows, but the number of rows exceeds the actual number of files in the file does not error.

The sed '/10[1-4]/d ' file displays files, excluding rows containing 101-104.

Sed ' 2, $d ' file displays files, showing only the first row. The sed ' 2,$!d ' file displays only the other rows except the first line.

Sed '/^ *$/d file deletes a blank line in the files.

2, sed-n '/10[1-4]/p ' file displays only the rows that contain 101-104 in file files. (-N and P must be used at the same time, otherwise only p displays all files and displays multiple rows found)

The sed-n ' 5p ' file displays only the 5th line of files

3, sed ' s/moding/moden/g ' file replaces moding with Moden

4, sed-n ' s/^west/north/p ' file replaces West's line with North and displays it.

5. The sed ' s/[0-9][0-9][0-9]$/&.5/' file replaces the 3-digit line in the file with the string that the original number plus the ". 5",& represents the search for.

6, sed ' s/\ (mod\) ing/\1en/g file will be mod as mode 1 encapsulated in parentheses, and then replaced.

The sed ' s/...$//' file deletes the last three characters of each line.

Sed ' s/^...//' file deletes the first three characters of each line.

7, sed ' s#moding#moden#g ' file replaces moding with the # behind Moden,s to represent the delimiters between search strings and replacement strings.

8, sed-n '/101/,/105/p ' file shows matching rows from 101 to 105. If only 101 matching rows are found, the matching rows from 101 to the end of the file.

Sed-n ' 2,/999/p ' file displays from line 2nd to matching rows.

9. Sed '/101/,/105/s/$/20050119/' file will increase the "20050119" content from the end of the line to 105 matching rows from 101.

10. Sed-e ' 1,3d '-e ' s/moding/moden/g ' file deletes 1-3 rows of the files before replacing them.

Sed-e '/^#/!d ' file shows the line at which the file begins with #.

11. Sed '/101/r newfile ' file adds NewFile content to each matching row

Sed '/101/w newfile ' file writes matching rows to NewFile.

12. Sed '/101/a\

> ### ' file adds a new row after the matching row.

Sed '/101/i\

> ### ' file adds a new row before matching rows.

Sed '/101/c\

> ### ' file replaces matching rows with new rows.

13. The sed ' y/abcd/abcd/' file replaces A, B, C, and D with ABCD respectively.

14. The sed ' 5q ' file is displayed to exit at the 5th row.

15. Sed '/101/{n; s/moding/moden/g} ' file finds the following line (n) to be substituted in the files.

The sed '/101/{s/moding/moden/g q;} ' file is replaced after the first matching row is found in the files and then exited.

16. Sed-e '/101/{h; D;} '-E '/104/{G;} ' file finds a matching row in a cache before matching the 104 row.

Sed-e '/101/{h; D;} '-E '/104/{g;} ' file finds a matching row with 101 in a cache before replacing the 104 matching row.

Sed-e '/101/h '-e ' $G ' file places the last matching row at the end of the file.

Sed-e '/101/h '-e ' $g ' file replaces the last row of the file with a matching row.

Sed-e '/101/h '-e '/104/x ' file has a cache in it that matches 101 rows, and then swaps with 104 of matching rows.

17. sed-f Sfile File operates according to a list of SFILE commands.

Cat Sfile

/101/a\

### #101 ####\

101****

/104/c\

### #104 deleted####\

deleted****

1i\

### #test ####\

test****

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