difference between sudo apt-get update and upgrade?

[fjr]

raspbian pixel
What is the difference between sudo apt-get update and sudo apt-get upgrade?

[DougieLawson]

Update updates the apt-get meta data. Upgrade uses that meta data to update packages on the system.

[fruitoftheloom]

raspbian pixel
What is the difference between sudo apt-get update and sudo apt-get upgrade?

https://linux.die.net/man/8/apt-get

[KMyers]

Sorry dont want to hijack this thread,

How often should one do this?

Thanks!
Ken

[Sam Miracle]

sudo apt-get update downloads the update, sudo apt-get upgrade installs the update. It is a good idea to do a sudo-reboot after updating too.

[DougieLawson]

Sorry dont want to hijack this thread,

How often should one do this?

Thanks!
Ken

If it's running as an internet server you MUST do it at least once a week possibly more frequently.

If it's just a client machine do it once a month.

All of my Raspberries have

Code: Select all

root@eagle /etc/apt/apt.conf.d # cat 02periodic
APT::Periodic::Enable "1";
APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Download-Upgradeable-Packages "1";
APT::Periodic::AutocleanInterval "7";
APT::Periodic::MaxAge "5";
APT::Periodic::MinAge "2";
APT::Periodic::Verbose "0";
root@eagle /etc/apt/apt.conf.d #

That /etc/apt/apt.conf.d/02periodic file means every day any new packages get downloaded, so there's no delay when I run my weekly dist-updates.

[mattmiller]

sudo apt-get update downloads the update, sudo apt-get upgrade installs the update

No - not really - its not quite as straightforward as that
read link that fruitofloom posted

[linxuser8671]

sudo apt-get update downloads the update, sudo apt-get upgrade installs the update

sudo apt-get update -------------- updates the OS ( i do this whenever i am missing packages [and/or once a week or so, its good habit])

sudo apt-get upgrade ----------- upgrades the OS ( i rarely do this but should probably more)

[B.Goode]

sudo apt-get update downloads the update, sudo apt-get upgrade installs the update

sudo apt-get update -------------- updates the OS ( i do this whenever i am missing packages [and/or once a week or so, its good habit])

sudo apt-get upgrade ----------- upgrades the OS ( i rarely do this but should probably more)

The first two replies to this query answered it concisely and accurately. A recursive reply that says that update updates adds nothing to the discussion.

[mfa298]

sudo apt-get update downloads the update, sudo apt-get upgrade installs the update

sudo apt-get update -------------- updates the OS ( i do this whenever i am missing packages [and/or once a week or so, its good habit])

sudo apt-get upgrade ----------- upgrades the OS ( i rarely do this but should probably more)

It doesn't work like that, Read the first response from Dougie.

apt-get update only updates the list of packages your system knows about, i.e. means it knows that the updates exist. It makes no changes to the installed packages i.e. nothing gets installed directly from that command.

apt-get upgrade will download those updated packages and install them (additionally dist-upgrade will do the same but will also install updates where new packages are required for dependencies - Most of the time there's no difference between upgrade and dist-upgrade)

[DougieLawson]

sudo apt-get update -------------- updates the OS [sic] ( i do this whenever i am missing packages [and/or once a week or so, its good habit])

No it does not. It updates the packages meta data used by apt-get for other operations.

[jahboater]

Try "apt" instead of "apt-get".
Apart from being less to type, you get notified if anything needs an upgrade:-

Code: Select all

pi@raspberrypi:~ $ sudo apt update
................      
Fetched 9264 kB in 18s (509 kB/s)                                                                  
Reading package lists... Done
Building dependency tree       
Reading state information... Done
2 packages can be upgraded. Run 'apt list --upgradable' to see them.
pi@raspberrypi:~ $ sudo apt upgrade -y

[KMyers]

Thanks for info Dougie, I have been running this every couple days, Do have VNC and trying to get MQTT running,

Back to regularly scheduled conversation, sorry for interruption.

[DougieLawson]

To get Mosquitto running you have to jump through some apt-get hoops (that gets you v1.4.10).
http://mosquitto.org/2013/01/mosquitto- ... epository/

If you just go with the plain Raspbian version you get a buggy ancient version of it.

[KMyers]

Yes I have a printout of your instructions here on my ext drive. I would like to get it to display graphs of my sensor network like Adafruit does. Any suggestions or shou;d I start a new thread on this?

Ken

[DougieLawson]

Yes I have a printout of your instructions here on my ext drive. I would like to get it to display graphs of my sensor network like Adafruit does. Any suggestions or shou;d I start a new thread on this?

Ken

Start a new thread.