Question

When the pattern is not found in a file, grep command silently returns the prompt.

(a) True

(b) False

This question was posed to me in final exam.

This is a very interesting question from grep command in chapter Filters using Regular Expressions of Unix

Answer 1

Right choice is (a) True

The explanation: grep command is also used as a filter for searching a pattern in a file. When the pattern is not found in the file, this command silently returns the prompt without displaying any diagnostic messages. For example,