sed

Part 1

1. Read Text File

sed r text.txt


2. Find & Replace

sed ‘s/UNIX/MINIX/g’ text.txt


3. Find & Replace ('g' Flag)

echo “UNIX UNIX UNIX” | sed ‘s/UNIX/GNU/g’
echo “UNIX UNIX UNIX” | sed ‘s/UNIX/GNU/’
4. Find & Replace (Uppercase)
sed ‘s/have/\U&/g’ text.txt
5. Find & Replace (Lowercase)
sed ‘s/UNIX/\L&/g’ text.txt
sed ‘s/GNU/\L&/g’ text.txt
echo “UNIX MINIX” | sed ‘s/MINIX/\L&/g’
6. Delete All Lines
sed ‘d’ text.txt
sed -i ‘d’ text.txt
sed ‘d’ text.txt > new_text.txt
7. Delete Particular Line
sed ‘1d’ text.txt
sed ‘1,3d’ text.txt
sed ‘4,6d’ text.txt
8. Delete All Blank Lines
sed ‘/^$/d’ text.txt

9. Reverse Delete Blank Lines
sed ‘/^$/!d’ text.txt

10. Delete Lines Containing Particular String
sed ‘/UNIX/d’ text.txt


Part 2

11. Find & Replace (Specific Line) 
sed '3 s/bsd/\U&/g' text2.txt
sed '1 s/gnu/\U&/g' text2.txt
sed '2 s/unix/\U&/g' text2.txt
12. Find & Replace (Column Number)
sed ‘s/gnu/\U&/1’ text2.txt

13. Find & Replace (Column Number & Specific Line)
sed ‘1 s/gnu/\U&/1’ text2.txt
sed ‘2 s/unix/\U&/1’ text2.txt
14. Find & Replace (Column Number & 'g' Flag)
sed ‘1 s/gnu/\U&/g1’ text2.txt

15. Find & Replace (Duplicate Column)
sed 's/\(bsd\)/\1 \1 \1/g' text2.txt
sed 's/\(gnu\)/\1 \1 \1/g' text2.txt
16. Find & Replace (Decorate Column)
sed 's/\(bsd\)/[\1]/g' text2.txt
sed 's/\(gnu\)/{\1}/g' text2.txt
17. Find & Replace (Delete All Line Numbers)
sed 's/^[0-9]*[0-9].//g' text3.txt

18. Find & Replace (Case Insensitive)
sed 's/bsd/changed/Ig' text2.txt

19. Delete Line (Case Insensitive)
sed '/unix/Id' text5.txt
sed '/bsd/Id' text5.txt
sed '/gnu/Id' text5.txt
20. Delete Line (OR Logic Regex)
sed '/<-\|->/d' text4.txt
sed '/sign\|just/d' text4.txt
sed '/sign\|just\|in/d' text4.txt

Part 3
 
21. Run Multiple Commands
sed -e 's/gnu/\U&/g' -e 's/bsd/\U&/g' text6.txt

22. Run Multiple Commands (Simpler)
sed 's/gnu/\U&/g; s/bsd/\U&/g' text6.txt

23. Combine sed with bash Looping Commands
for i in {6..8}; do sed '/bsd/d' "text$i.txt"; echo ""; done;

24. Delete Contents of Multiple Files (bash Looping)
for i in {6..8}; do sed -i 'd' text$i.txt; done

25. Rename Multiple Files (bash Looping)
for i in *.txt; do mv "$i" "`echo $i | sed "s/text/flext/g"`"; done
for i in *.txt; do mv -v "$i" "`echo $i | sed "s/^[0-9]*[0-9]//g"`"; done

26. Delete Multiple Files (bash Looping)
for i in *.txt; do rm -v "`echo $i | sed "s/^[0-9]*[0-9]//g"`"; done
for i in *.txt; do rm -v "`echo $i | sed -n "/^[0-9]*[0-9]/p"`"; done

27. Change Slash Delimiters to Another Characters
sed 's/unix/CHANGED/g' text6.txt
sed 's@unix@CHANGED@g' text6.txt
sed 's!unix!CHANGED!g' text6.txt
sed 's?unix?CHANGED?g' text6.txt

28. Adjust Line Spacing (Single)
sed ‘G’ text6.txt

29. Adjust Line Spacing (Double)
sed 'G;G' text6.txt

30. Find & Replace (Lines Range)
sed '1,3 s/unix/CHANGED/g' text6.txt 


Part 4

31. Print Matched Lines
sed -n '/unix/p' text9.txt

32. Print Reverse-Matched Lines
sed -n '/unix/!p' text9.txt

33. Bash Looping with Delay Time
for i in *.txt; do sed 's/x/[X]/g' $i; echo " "; sleep 1; done

34. Print The File Name
sed -n '$ F' text9.txt

35. Print The First Line
sed ‘q’ text9.txt

36. Print The Last Line
sed -n '$ p' text9.txt

37. Count Total Line Number
sed -n '$ =' text9.txt

38. Print Multiple Files' First Lines (bash Looping)
for i in *.txt; do sed ‘q’ $i; done
for i in *.txt; do sed -n '$ F' $i; sed 'q' $i; done
39. Print Multiple Files' Last Lines (bash Looping)
for i in *.txt; do sed -n '$ p' $i; done
for i in *.txt; do sed -n '$ F' $i; sed -n '$ p' $i; done
40. Count Multiple Files Line Numbers (bash Looping)
for i in *.txt; do sed -n '$ F; $ =' "$i"; done


Part 5

41. Delete Comment Lines (Double Slash Style)
sed '/^\/\/.*$/d' text12.txt

42. Delete Comment Lines (Double Slash Style, Except At Line Beginning)
sed 's+\([^!]\/\/.*$\)++g' text12.txt

43. Delete Comment Lines (Hash Style)
sed '/^#[^!].*.$/d' text13.txt

44. Delete Comment Lines (Slash-Asterisk Style)
sed '/\/\*/,/\*\//d' text14.txt

45. Boolean Operator OR
sed -E -n '/this|line|return/p' text14.txt

46. Boolean Operator AND
sed -n '/this.*comment/p' text14.txt
sed -n '/this.*slash.*comment.*/p' text14.txt
47. Multiple Convert Images (PNG to JPEG)
for i in *.png; do convert -verbose "$i" "`echo $i | sed 's/.png/.jpeg/g'`"; done

48. Multiple Convert Images (JPEG to PNG)
for i in *.jpeg; do convert -verbose "$i" "`echo $i | sed 's/.jpeg/.png/g'`"; done

49. Insert A Single Line
sed '1i # THIS IS A NEW LINE' text13.txt
sed '3i # THIS IS A NEW LINE' text13.txt
50. Insert Multiple Lines
sed '3i # THIS IS A NEW LINE\n# THIS IS ANOTHER LINE' text13.txt


Part 6

51. Print Only Lines Between Two Patterns
sed -n '/gnu/,/dunix/p' text15.txt
sed -n '/dunix/,/sunos/Ip' text15.txt
52. Delete Only Comment Lines Between Address Range
sed '10,19{/\/\*/,/\*\//d}' text14.txt
sed '10,19{/\/\//d}' text14.txt
53. Delete Only Comment Lines Between Two Patterns
sed '/printf/,/printf/{/\/\*/,/\*\//d}' text14.txt
sed '/^/,/main/{/\/\*/,/\*\//d}' text14.txt
54. Edit Only Matched Lines Between Address Range
sed '4,7{s/x/[X]/Ig}' text15.txt

55. Edit All Uppercase Characters (POSIX Character Class)
sed 's/[[:upper:]]/[X]/g' text15.txt

56. Edit All Lowercase Characters (POSIX Character Class)
sed 's/[[:lower:]]/[X]/g' text15.txt

57. Edit All Punctuation Characters (POSIX Character Class)
sed 's/[[:punct:]]/[X]/g' text15.txt

58. Edit All Uppercase & Lowercase (POSIX Character Class)
sed 's/[[:alpha:]]/[X]/g' text15.txt

59. Edit All Numeric Characters (POSIX Character Class)
sed 's/[[:digit:]]/[X]/g' text15.txt

60. Edit All Space & Tab Characters (POSIX Character Class)
sed 's/[[:blank:]]/[X]/g' text15.txt