How to find and replace string in a file with a variable in Shell script?

Question

I want Shell script to find my Orignal_literal and change it with dynamic literal, this literal would be runtime input to script.

Answer 1

sed -i "s/Orignal_literal/c \\$variable/g" file.txt

Explanation:

• sed = Stream Editor
• -i = In-place (i.e. save back to the original file)
• The command string:
  • s: The substitute command
  • Orignal_literal: A regular expression describing the word to replace (or just the word itself)
  • g: Global (i.e. replace all and not just the first occurrence)
  • variable: Runtime variable
  • file.txt: The file name