ISRO PRL Technical Assistant CS/IT 2025

Detailed Explanation:

HTML comments begin with <!-- and end with -->.

Browsers do not render the comment text as page content.

Detailed Explanation:

The kernel is the central component of an operating system.

It manages resources such as CPU time, memory, devices, processes, and system calls.

A shell or graphical interface provides ways for users to interact with the operating system, but it is not the OS core.

Detailed Explanation:

uname displays system information; by default, it prints the kernel name.

On a Linux system, the usual output for uname is Linux.

uname -a displays additional system details.

Detailed Explanation:

man cp opens the manual page for the cp command.

The manual page describes its purpose, syntax, options, and usage.

Detailed Explanation:

In Bash, brace expansion with {1..3} generates the sequence 1 2 3 before the command is executed.

Thus, touch file{1..3}.txt expands to touch file1.txt file2.txt file3.txt.

This creates the three files, provided the command is run in a shell that supports brace expansion (such as Bash).