1.Which command allows you to engage in direct, two-way communication with a user who is currently logged into the system?
2.Which wildcard character in a shell is used to represent zero or more characters in a filename?
3.Which special shell variable represents the process ID of the current shell?
4.Which key is employed to overstrike an entire line?
5.Which symbol is utilized with the chmod command to set exact permissions?
6.Which command reveals the terminal device name currently in use?
7.Which symbol allows you to add content to the end of a file rather than replacing its existing data?
8.Which command allows you to display a file's content in increments of 24 lines?
9.The initial trio of permission characters (rw) in a file's mode represents the owner's rights. What does this signify about the owner's access?
10.What is the octal equivalent of the command chmod ugo+rw note?
11.Which command is utilized to set up an automatic reminder service?
12.Which command allows you to navigate into a directory whose name starts with the letter 'p'?
13.Which command will search the entire system for files named .profile?
14.Which flag should be applied with the sort command to begin sorting from the nth column of the (m+l)th field?
15.Which attribute is found in the seventh field of the /etc/passwd file?
16.Which option is utilized to show the number of blocks occupied by a file?
17.Which command removes every file in the current folder along with all files and nested directories within its subfolders?
18.Identify the command below that is not used for communication purposes.
19.Which command displays all files, including hidden ones, in a directory?
20.Which command is utilized to delete a directory?