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USEFUL_COMMANDS.md

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System Information

Current Release Information
lsb_release -a

Kernal information
uname -a

ARM CPU Temperature
cat /sys/class/thermal/thermal_zone0/temp

GPU Temperature
vcgencmd measure_temp
OR (if /opt/vc/bin isn't in your path)
/opt/vc/bin/vcgencmd measure_temp

CPU Frequency information
(useful if pi is overclocked)
sudo apt install cpufrequtils
sudo cpufreq-info -sm (view frequency distribution)
watch -n 1 -x sudo cpufreq-info -fm (watch frequency, updated every 1 sec)

Process Management

View all enabled/running service
sudo systemctl --type=service

Reload system processes after a service file change
systemctl daemon-reload

Start service at boot
systemctl enable <service_name>.service

Control/check service
systemctl [start|stop|restart|status] <service_name>.service

Follow logs for a service
journalctl -u <service_name>.service -f

Grep logs
journalctl -u <service_name>.service | grep -i error

Memory/Hardware Management

Free memory free -h

Memory configuration, maximum, and speed informatio
sudo dmidecode -t memory

CPU Frequency cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq

CPU information lscpu

Using hwinfo
sudo apt install hwinfo
hwinfo --short # show short version of hwinfo
hwinfo --disk # show disk info

Disk Management

Size of directory
du -shc /dir

View partions
parted -l

Partion drives
parted <device> (parted) select <device> (parted) gpt (options: aix, amiga, bsd, dvh, gpt, mac, ms-dos, pc98, sun, loop) (parted) print (to view changes) (parted) mkpart <name> ext4 0% 100% (to use full drive) quit (to save changes)

Remove partions
parted <device> rm <partion_num>

Format Hard Disk
mkfs -t ext4 <device> (eg. /dev/sda1)

Mount disk
``

Unmount Disk
``

Disk Information

View block devices with extended information
lsblk -fm

List partitions
sudo fdisk -l

Networking

Use curl over a specific interface curl --interface eth0 https://api64.ipify.org curl --interface tun0 google.com https://api.ipify.org

Network Namespaces

Enter shell with network namespace
ip netns exec ns1 /bin/bash --rcfile <(echo "PS1=\"namespace ns1> \"")

RSync

Running rsync in the background - and viewing output.
nohup rsync -avp [src] [dst] &
tail -f nohup.out

Screen

Name you screen sessions
screen -S <session-name> (name for refrence when using screen -ls)

List open screens
screen -ls

Reattach to screen
screen -r <pid>