The grep command should support multiple flags at once.įor example, running grep -l -v "hello" file1.txt file2.txt should Lines to be prefixed with its line number: 1:helloĪnd if we run grep -i "HELLO" input.txt, we'll do a case-insensitive match, If we run grep -n "hello" input.txt, the -n flag will require the matching -x Only match entire lines, instead of lines that contain a match.-v Invert the program - collect all lines that fail to match the pattern.-i Match line using a case-insensitive comparison.
-l Print only the names of files that contain at least one matching line.-n Print the line numbers of each matching line.If we were to call grep "hello" input.txt, the returned string should be: helloĪs said earlier, the grep command should also support the following flags: Note that the lines shouldīe output in the order in which they were found, with the first matching lineĪs an example, suppose there is a file named "input.txt" with the following contents: hello Of the specified files, find the lines that match the specified patternĪnd then output those lines as a single string. Your task is to implement the grep function, which should read the contents One or more files in which to search for matching lines.Zero or more flags to customize the matching behavior.The pattern used to match lines in a file.That match a user-provided search query (known as the pattern). The Unix grep command can be used to search for lines in one or more files Number and contents of each matching line. Search a file for lines matching a regular expression pattern.
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