Linux & Proxmox Command Line Toolbox#

# Purge unused packages and clean cache
apt autoremove --purge && apt autoclean

# Reclaim journal log space (limit to 500MB)
journalctl --vacuum-size=500M

# List all files with human-readable sizes
ls -lah

# Summary of folder sizes in current directory
du -sh *

# Identify top 10 largest folders on root
sudo du -xh / | sort -rh | head -n 10

# Disk space usage summary (filtered for MB/GB)
du -cha --max-depth=1 / | grep -E "M|G"

# Find files larger than 25MB in project
find /home/marc/hugo/canada2argentina -type f -size +25M -exec ls -lh {} +

# Count total files in the public build folder
find /home/marc/hugo/canada2argentina/public -type f | wc -l

# List top 25 largest files in project
find /home/marc/hugo/canada2argentina -type f -exec du -h {} + | sort -rh | head -n 25

# Wipe all partitions/signatures from a disk (CAUTION)
sgdisk --zap-all /dev/sdX

# Detailed SMART health report
smartctl -a /dev/sda | less

# Deep scan for bad blocks (Takes a long time)
badblocks -v /dev/sda -s

# Unlock a stuck VM or Container
qm unlock <vmid>
pct unlock <ctid>

# Resize a container disk (Final size, cannot shrink)
pct resize 103 rootfs 16G

# List running LXC containers
pct list | awk 'NR>1'

# Disable HA for a specific VM/CT to allow manual fixes
ha-manager set vm:200 --state disabled
ha-manager set ct:103 --state disabled

# Update and list available CT templates
pveam update
pveam available

# List all active apt sources
grep -r '' /etc/apt/sources.list*

# List and pin a specific kernel
proxmox-boot-tool kernel list
proxmox-boot-tool kernel pin 6.8.8-4-pve

# Check DNS resolution
nslookup google.com
nslookup pi.hole

# Check open listening ports
ss -lntu
netstat -plant

# Performance test (Client mode, 8 parallel streams)
iperf3 -c 10.1.1.11 -P8

# View real-time system logs for USB/Kernel errors
dmesg -w
dmesg -T | grep usb

# Clear "Remote Host Identification Changed" error
nano ~/.ssh/known_hosts

# Copy local images from Mac to Hugo site on Server
scp -v /Users/marc/Downloads/to_convert/* root@10.1.2.202:/home/marc/hugo/canada2argentina/static/images/

# Backup and transfer a folder between servers
tar -czvf "$(date +%Y-%m-%d_%Hh%M)_PangolinBackup.tar.gz" pangolin/
scp pangolin.tar.gz root@72.11.147.220:/home/marc/docker-compose

# Clear RAM cache (Drop caches)
sync && echo 3 | tee /proc/sys/vm/drop_caches

# Check ZFS ARC summary and free RAM
arc_summary -s arc && free -h

# Get BIOS version and serial info
sudo dmidecode -t bios

# List SCSI and PCIe hardware
lsscsi -u
lspci

# Make script executable and run
chmod +x ./unifi-9.0.114.sh && ./unifi-9.0.114.sh

# Instant test of cron behavior (Sends message to all terminals)
* * * * * echo "Hello from cron" | wall

# Cancel a pending shutdown
shutdown -c

# Print the path of the folder you are in
pwd