What is the command used for making a rescue of a file system?

The command used for making a rescue of a file system is 'fsck', which stands for "file system check." This command is specifically designed to check the integrity of a filesystem and repair any inconsistencies that may occur due to improper shutdowns, corruption, or other similar issues. When executed, 'fsck' scans the specified filesystem for errors and may prompt the user to fix those errors on the spot, making it an essential tool for filesystem recovery.

In contrast, 'mount' is used to attach a filesystem to a directory, allowing access to files and directories within that filesystem. 'recovery' is more vague and not a standard command in Linux related to filesystem rescue; it is often used in a broader context without a specific function. 'restore' typically refers to recovering files from backups, and while it pertains to restoring files, it does not address the filesystem integrity in the same way 'fsck' does. Therefore, 'fsck' emerges as the correct answer due to its specific functionality regarding filesystem integrity and repair.