Exam LX0-103 topic 3 question 30 discussion

Here's a breakdown of what each part of the command does: sed is a command-line utility used for text processing and manipulation. 's/bob/Bob/g' is a command that tells sed to substitute (or replace) all occurrences of the string "bob" in the input with the string "Bob". The g at the end of the command tells sed to perform the substitution globally, i.e., on every occurrence in the input. letter is the name of the input file to be processed by sed. > is a redirection operator that tells the shell to redirect the output of the command to a new file, rather than to the terminal window. newletter is the name of the new file where the modified contents of "letter" will be saved. So, the overall effect of the command is to search for all occurrences of "bob" in the file "letter", replace them with "Bob", and save the modified contents to a new file named "newletter". This command can be useful for making bulk changes to a file, such as correcting the capitalization of a name or correcting a misspelling.