Exam LX0-103 topic 3 question 38 discussion

Here's how it works: tr is a command-line utility that translates or deletes characters in a stream of data. -s is an option for tr that squeezes multiple consecutive occurrences of a character into a single occurrence. ' ' is the character that you want to squeeze, which in this case is a space. < a.txt is a shell redirection that takes the contents of the file a.txt as input to the tr command. > b.txt is a shell redirection that sends the output of the tr command to the file b.txt. So, the overall effect of the command is to read the contents of the file a.txt, replace all consecutive spaces with a single space, and write the modified contents to the file b.txt.