When installing software in debian systems we can put something like this:

sudo apt-get install -y chromium-browser

that way the installation occurs automatically, whitout asking to confirm installation [Y/n]. Can i do the same with pacman?

up vote 62 down vote accepted

From man pacman:

Bypass any and all “Are you sure?” messages. It’s not a good idea to do this unless you want to run pacman from a script.

Note the qualification about using this with care...

Arch is a rolling release, which means pacman has to, from time to time, manage some quite complex upgrades. At these times pacman will prompt you to confirm your choices—disregarding these prompts will generally not be a significant issue, but in some cases, as with the recent move from /lib to /usr/lib , a lack of attention will cause major breakage. This is a not a habit you want to cultivate.

  • I've never run pacman with the "--noconfirm" in about 3 years of using Arch, because of that warning. How many people run pacman from a script? What are the big risks? I have had to intervene 3 or 4 times to fix things that pacman has refused to upgrade. – Bruce Ediger Oct 19 '12 at 3:18
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    I assume, given Arch's culture, that the warning is there to discourage complacency and the misguided notion that automating pacman updates is a good idea. A lot of breakage can be put down to people not reading pacman's output; --noconfirm would exacerbate that... – jasonwryan Oct 19 '12 at 3:31
  • I have an "install" script that uses --noconfirm. The idea is to be able to take a system with a recently updated clean install and make it "usable" without any user interaction. – StrongBad Oct 19 '12 at 9:42
  • The idea is to install software from a script without any user interaction, so this is perfect. Thanks! – JohannRamos Oct 19 '12 at 12:52
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    Actually, --noconfirm doesn't assume yes, instead it assumes the default answer, which is quite often no. Example: # pacman -Scc Cache directory: /var/cache/pacman/pkg/ :: Do you want to remove ALL files from cache? [y/N] For the case above, yes|pacman -Scc assumes yes – Utgarda Sep 26 '17 at 10:30

While the manpage on the matter is not very clear, the --noconfirm flag will not assume "yes" on every answer. It assumes the default answer which can be "no" sometimes.

      Bypass any and all “Are you sure?” messages. It’s not a good idea
      to do this unless you want to run pacman from a script

To assume "yes", you could pipe the output of the yes command to pacman.

yes | sudo pacman -S firefox
  • Use yes | LC_ALL=en_US.UTF-8 pacman [...] for compatibility with systems whose language is not set to English. Otherwise the [Y/n] questions become [J/n], for example. – ComFreek Jul 20 at 6:48
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    Also beware this answer fails if Pacman ever asks a question without a y answer, e.g. Enter a selection (default=all). – ComFreek Jul 20 at 6:58

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