Ubuntu – What does -y mean in apt-get -y install command

apt

I always see commands like this

apt-get -y install

What is the -y tag for and what is the difference between apt-get install with and without the -y tag?

Best Answer

From the results of running man apt-get

-y, --yes, --assume-yes
           Automatic yes to prompts; assume "yes" as answer to all prompts and
           run non-interactively. If an undesirable situation, such as
           changing a held package, trying to install a unauthenticated
           package or removing an essential package occurs then apt-get will
           abort. Configuration Item: APT::Get::Assume-Yes.

If you run an apt-get command without the -y option, you need to answer to all prompts that you get from that command interactively in order for the execution of the command to continue.

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Ubuntu – Difference between apt-get -d install & apt-get download

I could list following:

1) Try both without sudo, apt-get download will pass and apt-get -d install will fail (root required)

2) By default apt-get -d install will save .deb in /var/cache/apt/archives and apt-get download in current directory

3) apt-get download is newer, you wouldn't even find it in the old versions.

I hope they are helpful

Ubuntu – the difference between sudo apt-get install and sudo apt install

Not much. apt is a new command that supposed to merge several functions from apt-get and apt-cache into one command. It's still a little rough around the edges but here's the command listing from --help:

Basic commands: 
 list - list packages based on package names
 search - search in package descriptions
 show - show package details

 update - update list of available packages

 install - install packages
 remove  - remove packages

 upgrade - upgrade the system by installing/upgrading packages
 full-upgrade - upgrade the system by removing/installing/upgrading packages

 edit-sources - edit the source information file

The equivalent functions are designed to work in similar ways but it's not a proxy command (it's not calling the old ones - it's a new interface directly onto the Apt libraries) so there may be some edge-case changes.

There are also some obvious omissions (download, policy, etc) that power-users will miss and there are a whole raft of undocumented commands (purge still works but I can't find anything on it).

16.04 Update: A lot of the omissions have now been included but aren't yet documented, nor do they have Bash-completions. It's a shame it's taking this long to implement functionality that already exists in the codebase but oh well. My advice is that if you're used to an apt-{get,cache} command, try it on apt. It might work.

There's also a DIFFERENCES TO APT-GET(8) section in the man apt page that's interesting:

   The apt command is meant to be pleasant for end users and does
   not need to be backward compatible like apt-get(8). Therefore
   some options are different:

   ·   The option DPkgPM::Progress-Fancy is enabled.

   ·   The option APT::Color is enabled.

   ·   A new list command is available similar to dpkg --list.

   ·   The option upgrade has --with-new-pkgs enabled by default.

And if you want Bash-completions, I've had an attempt as writing a completions file for it already. These are included with later Ubuntu installs.

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