Bash Shell Scripting- Simple Practice with grep command

The video tutorial explains how to use the GREP command to filter directories and files from command outputs. It also covers writing patterns to extract valid IPv4 addresses from a file. The tutorial emphasizes understanding the structure of directories, files, and IPv4 addresses to create effective GREP patterns. It provides step-by-step guidance on constructing these patterns and validating them to ensure accurate filtering.

What is the primary indicator in the 'ls' command output that a line represents a directory?

• The line starts with a hyphen ('-')

• The line ends with a slash ('/')

• The line contains the word 'directory'

• The line starts with a 'd'

How can you identify a file in the 'ls' command output?

• The line starts with a hyphen ('-')

• The line ends with a dot ('.')

• The line contains the word 'file'

• The line starts with a 'd'

What is a key characteristic of a valid IPv4 address?

• It has five parts

• It ends with a semicolon (';')

• Each part can have up to four digits

• Each part can have one to three digits

How many parts does a standard IPv4 address have?

• Two

• Three

• Four

• Five

What is the purpose of using curly braces in a GREP pattern for IPv4 addresses?

• To indicate the start of a new line

• To specify the number of times a digit can appear

• To escape special characters

• To match exactly four digits

Why is a backslash used before a dot in a GREP pattern?

• To match a literal dot

• To start a new line

• To match any character

• To end a line

What does the GREP pattern '0-9' signify in the context of matching IPv4 addresses?

• It matches any digit from 0 to 9

• It matches any letter

• It matches any whitespace

• It matches any special character