2. The following command will copy all files with the name that begins with any single char followed by either character 4 or 5 and ends with any other characters.
a) cp ?[45]* ~/
b) cp ????? /
c) cp a4file ~/
d) cp *[45]* ~/
The correct answer is a) cp ?[45]* ~/.
Explanation:
- The question mark (?) matches any single character.
- [45] matches either 4 or 5.
- The asterisk (*) matches any number of characters.
- The tilde (~) represents the home directory of the current user.
Therefore, the command will copy all files that begin with any single character, followed by either 4 or 5, and end with any other characters to the home directory of the current user.
The correct answer is option A) cp ?[45]* ~/
To understand why this is the correct answer, let's break down the command and explain how it works:
1. cp: This is the command for copying files.
2. ?[45]*: This is a pattern that matches any file with a name that starts with any single character, followed by either a 4 or 5, and ends with any other characters. The "?" matches any single character, "[45]" matches either a 4 or 5, and "*" matches any number of characters.
3. ~/: This is the destination folder where the files will be copied to. In this case, "~/" represents the user's home directory.
So, when you execute the command "cp ?[45]* ~/," it will find all files in the current directory that match the specified pattern and copy them to the user's home directory.
Option B) cp ????? / uses a pattern of five question marks, which will match any file with exactly five characters in its name. This is not the correct pattern to match files with names that begin with any single character followed by either 4 or 5.
Option C) cp a4file ~/ copies a file named "a4file" to the user's home directory. This does not match the specified pattern of files that begin with any single character followed by either 4 or 5.
Option D) cp *[45]* ~/ uses the "*" wildcard to match any number of characters, followed by either a 4 or 5, and any number of characters. This pattern will match files with names that contain 4 or 5, but it does not restrict the pattern to files with names that begin with any single character.
Therefore, the correct answer is option A) cp ?[45]* ~/ as it matches the specified pattern correctly.
The correct answer is option a) cp ?[45]* ~/
Here is a step-by-step breakdown of the command:
1. cp - This is the command to copy files.
2. ? - This represents any single character.
3. [45] - This represents the character 4 or 5.
4. * - This represents any other characters, any number of times.
5. ~ - This indicates the home directory.
So, the command will copy all files that begin with any single character, followed by either character 4 or 5, and end with any other characters. The copied files will be placed in the home directory (~).