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comprehensive battery information

powercfg /batteryreport

windows health checkup

dism /online /cleanup-image /checkhealth

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taking control of virtual machine ID allocation in proxmox

lower = 201 # lower vid limit
upper = 250 # upper vid limit

pvesh set /cluster/options --next-id lower=201,upper=250

determine the system installation time

stat --format "%w" /

allow users to access the kernel ring buffer and view the messages using dmesg

sysctl kernel.dmesg_restrict=0

device info via udev

udevadm info -a -n /dev/{device_to_query}

limiting interface throughput using htb

tc qdisc add dev {interface} root handle 1: htb
tc class add dev {interface} parent 1: classid 1:50 htb rate 50mbit ceil 50mbit
tc class add dev {interface} parent 1: classid 1:100 htb rate 100mbit ceil 100mbit
tc class add dev {interface} parent 1: classid 1:500 htb rate 500mbit ceil 500mbit

iptables -t mangle -A POSTROUTING -o {interface} -d {ip} -j CLASSIFY --set-class 1:50
iptables -t mangle -A POSTROUTING -o {interface} -d {ip} -j CLASSIFY --set-class 1:100
iptables -t mangle -A POSTROUTING -o {interface} -d {ip} -j CLASSIFY --set-class 1:500

dns and dhcp

dnsmasq --no-daemon --port=53 \
  --dhcp-range=192.168.255.100,192.168.255.200 --dhcp-leasefile=/dev/null \
  --bind-interfaces --interface=eth0 --listen-address=192.168.200.1

tftp only

dnsmasq --no-daemon --port=0 \

move the socket

mv /var/run/docker.sock /var/run/docker.sock.original

redirect all socket communications to a tcp listener in port 1234

socat TCP-LISTEN:1234,reuseaddr,fork UNIX-CONNECT:/var/run/docker.sock.original

arp command with vendor information

arp -n | grep -viE "inc|iface" \
  | while read -r ip type mac state ifname; \
    do vendor=$(echo ${mac^^} \
    | sed 's/://g' \
    | cut -c 1-6); echo -ne "${ifname}\t${ip}\t${mac} $(grep ${vendor} /usr/share/ieee-data/oui.txt \
    | cut --output-delimiter=" " -c 1-6,23- )\n"; \
    done