Raspberry Pi Reminders

Thu, 10 Sep 2026 17:43:49 +0100

Show temperature of Rasp Pi:

$ cat /sys/class/thermal/thermal_zone0/temp
53692

This means 53.6 degC : i.e. you have to divide by 1000 to get the temp in degC :

BOB=`cat /sys/class/thermal/thermal_zone0/temp`
expr $BOB / 1000    # divide by 1000

to use ‘sar’ for recording system performance:

# apt install sysstat

(optional) set it to run every 5min instead of 10min in /etc/cron.d/sysstat
change ENABLED="false" to “true” in /etc/default/sysstat

# systemctl enable sysstat

Linux apt Package Manager

Sun, 30 Aug 2026 10:11:27 +0100

Since I mainly use Debian-based Linux flavours, I have had to get used to the apt package manager which Debian uses. I find it a bit unintuitive to use, as there seem to be several different programs to do basic things.

Note: many of the apt commands shown below need to run as root, so you should prefix each command with ‘sudo’ if running as a normal user.

# apt update - this downloads package information from the internet on which packages/versions are available. N.B. it does not actually update any packages, it just updates the package manager’s catalogue/cache/list of what updates are available.

RaspberryPi on handy tech tips & reminders

Raspberry Pi Reminders

Show temperature of Rasp Pi:

to use ‘sar’ for recording system performance:

Linux apt Package Manager