I am doing an online course "Introduction to Linux" [image: edX] Home Page LinuxFoundationX: LFS101x.2 Introduction to Linux Chapter 13: Manipulating Text; Section 2. sed & awk ~$ cat > test1 This is a Sample Test File for the sed command. The sed command is used to edit contents in a file. For example, the sed command is used to replace words in a line or file. ~$ sed s/is/are/ test1 Thare is a Sample Test File for the sed command. The sed command are used to edit contents in a file. For example, the sed command are used to replace words in a line or file. As you can see above the 1st instance of "is" in "This" is replaced by "are" giving "Thare"; BUT the following two lines also have "is" replaced by "are" EXCEPT for the "is" after "Thare". It is ALMOST as if I had invoked the global: sed s/is/are/g test1 EXCEPT for the 2nd "is" after "Thare"? I am using sed version: sed (GNU sed) 4.2.2 'b'ye - Bruce Gilbert. "For we have not been given a spirit of fear, but a spirit of Power; of Love; & of a Sound Mind." 2nd Timothy, chapter 1, verse 7.