Operating Systems and File Management
Operating Systems and File Management tests functions of an OS, interfaces, file hierarchy, extensions, and safe file operations.
Core ideas
- An OS manages processes, memory, devices, files, and users; it provides a user interface and security.
- GUI uses windows/icons/menus/pointer; CLI accepts typed commands. Windows, Linux, macOS, Android, and iOS are OS examples.
- A file has a name and extension; the extension suggests the associated application (.docx, .xlsx, .pptx, .pdf, .jpg, .mp3, .exe).
- Folders create a hierarchy. A path such as C:\Users\Riya\Documents\project.docx names drive, folders, and file.
- Operations: create, rename, copy, move, delete, restore, compress, back up. Copy leaves the original; move removes it from the source.
- Extensions are not guarantees of content; malware often uses double extensions like invoice.pdf.exe.
Worked example
A student saves report.docx in D:\IT\Project and needs a copy on a pen drive. The source path is D:\IT\Project\report.docx; the destination might be E:\Backup\report.docx. Copying preserves the original; moving would remove it from D:\IT\Project. If the pen drive is FAT32, a single file larger than 4 GB cannot be copied-use exFAT/NTFS or split the file. Check free space before copying.
Traps
Do not say “deleting to Recycle Bin frees space immediately”; empty it or use Shift+Delete. Do not confuse Recycle Bin with System Restore. A shortcut is not the file. Changing an extension does not convert the format. Path separators differ: Windows uses backslash, Linux/macOS use slash.