Linux disk quotas: Which administrative command is used to set (edit) user and group quotas on a Linux system?

Introduction / Context:
Disk quotas limit the amount of filesystem space or inodes a user or group can consume. Linux provides a set of quota tools to enable, configure, and report usage. Administrators must know which tool actually edits quota limits versus those that merely enable or display them.

Given Data / Assumptions:

• Traditional quota tools are installed (quota, quotaon, edquota).
• Filesystems are mounted with quota support where applicable.
• Goal: change the hard/soft limits for users or groups.

Concept / Approach:

The workflow typically is: enable quotas with quotaon, optionally initialize with quotacheck, and then set limits with edquota. The quota command displays current usage and limits; it does not edit them. Nonexistent commands (like /sbin/usrquota) are distractors.

Step-by-Step Solution:

Verification / Alternative check:

After editing, use quota -u user or repquota -a to confirm limits. Ensure /etc/fstab includes usrquota and/or grpquota options and that quotaon has been executed.

Why Other Options Are Wrong:

• /sbin/usrquota: Not a standard quota command.
• /sbin/quotaon: Enables quotas on a filesystem; does not edit limits.
• /sbin/quota: Displays usage and limits; read-only reporting.
• None of the above: Incorrect because /sbin/edquota is correct.

Common Pitfalls:

Editing quotas before enabling them; forgetting to mount filesystems with quota options; misinterpreting block units (often 1 KB or 1 block size unit depending on build); and not running quotacheck after major changes.

Final Answer:

/sbin/edquota