When administering multi-user Linux systems, monitoring individual disk consumption becomes crucial for resource allocation and troubleshooting. While df shows filesystem-level usage and du scans directories, neither directly provides user-specific data aggregation.

quota /h2>

For systems with disk quotas enabled:

# Check quota for all users
repquota -a

# User-specific report
quota -v username

Note: This requires pre-configured quotas and may not reflect actual usage in unquotaed systems.

find and du /h2>

For comprehensive user-level reporting without quota setup:

# Single-line solution
find / -type f -printf "%u %s\\n" | awk '{user[$1]+=$2} END{for(u in user) printf "%s %.2fMB\\n",u,user[u]/1024/1024}'

# Human-readable format alternative
sudo du -sh /home/* 2>/dev/null | sort -h

For RHEL environments (as mentioned in your PS), this enhanced script handles edge cases:

#!/bin/bash
TMPFILE=$(mktemp)

# Scan all mounted filesystems excluding special types
awk '$2 ~ /^\\/$|\\/home|\\/var|\\/usr/ {print $2}' /proc/mounts | while read -r mount; do
    find "$mount" -xdev -type f -printf "%u %s\\n" 2>/dev/null >> "$TMPFILE"
done

# Process results
awk '{
    user[$1] += $2
    total += $2
}
END {
    for (u in user) 
        printf "%-15s %8.2f MB\\n", u, user[u]/1024/1024
    printf "%-15s %8.2f MB\\n", "TOTAL", total/1024/1024
}' "$TMPFILE" | sort -k2nr

rm "$TMPFILE"

For large filesystems:

• Add -xdev to prevent crossing filesystem boundaries
• Exclude virtual filesystems (/proc, /sys)
• Run during off-peak hours

For interactive exploration:

sudo ncdu -x / --exclude /mnt --exclude /media

Pro tip: Press 'g' to toggle between GB/MB display.

When administering a multi-user Linux system (particularly in enterprise environments like Red Hat Enterprise Linux), monitoring disk consumption per user becomes crucial for:

• Quota management
• Resource allocation
• Identifying storage hogs
• Capacity planning

While there's no single standard command, this robust combination gives precise results:

# Basic version for home directories
sudo du -sh /home/* | sort -hr

# Advanced version with user mapping
sudo find / -type f -user username -exec du -sh {} + | awk '{sum += $1} END {print sum}'

Here's a production-ready script that handles:

#!/bin/bash

# Output header
printf "%-15s %10s\\n" "USER" "USAGE(MB)"

# Process all users with home directories
for user in $(cut -d: -f1 /etc/passwd); do
    home=$(eval echo "~$user")
    if [ -d "$home" ]; then
        size=$(du -sm "$home" 2>/dev/null | cut -f1)
        [ -n "$size" ] && printf "%-15s %10s\\n" "$user" "$size"
    fi
done

# Add total calculation
total=$(df -m --total | awk '/total/ {print $3}')
printf "\\n%-15s %10s\\n" "TOTAL" "$total"

For NFS Mounts

sudo du -sh /nfs_mount/* --exclude=/nfs_mount/lost+found | while read size user; do
    echo "${user##*/} ${size}"
done

Using Extended Attributes (XFS)

sudo xfs_quota -x -c 'report -h' /mount_point

On large filesystems:

• Add --time to monitor execution duration
• Use nice -n 19 to reduce priority
• Exclude virtual filesystems with --exclude