1. What is an inode in Linux?
-An inode (index node) is a data structure that stores metadata about a file such as file size, permissions, ownership, timestamps, and disk block locations — but not the file name or its path.
- Each file has one unique inode, and file names are stored in directory entries that map names to inode numbers.
#ls -i filename (Example command)
Shows the inode number of a file.
2. How can you check disk space usage on a Linux system?
- df -h (You can use this commands)
-Displays disk space usage for all mounted file systems in human-readable form.
du -sh /path/to/dir- Shows total disk usage of a directory.
- Real-time tip: Use du -h --max-depth=1 to find which directories consume the most space.
3. What happens when a file is deleted in Linux while a process is still using it?
- The file’s directory entry is removed, but the data remains on disk until the process releases the file descriptor.
- You can identify such files using:
lsof | grep deleted- If you need to reclaim space