[gentoo-user] what's the difference between the emerge options -u and -n?

[gentoo-user] what's the difference between the emerge options -u and -n?

[n952162]

Assuming no "emerge --sync" has been done, e.g.

I've been using -u to mean, "don't update if there's nothing new" (which
I would actually think would be the default).  Maybe that's wrong?  -n
is better?

Re: [gentoo-user] what's the difference between the emerge options -u and -n?

[Arve Barsnes]

On Sat, 28 Nov 2020 at 21:04, n952162 <n952162@web.de> wrote:
>
> Assuming no "emerge --sync" has been done, e.g.
>
> I've been using -u to mean, "don't update if there's nothing new" (which
> I would actually think would be the default).  Maybe that's wrong?  -n
> is better?

In my book, there's only one reason to ever use -n, and that's if
you've installed a package with -1 (--oneshot), and want to add it to
your world file, so that it doesn't get depcleaned. Use -u for your
regular system updates.

Regards,
Arve

Re: [gentoo-user] what's the difference between the emerge options -u and -n?

[Dale]

n952162 wrote:
> Assuming no "emerge --sync" has been done, e.g.
>
> I've been using -u to mean, "don't update if there's nothing new" (which
> I would actually think would be the default).  Maybe that's wrong?  -n
> is better?
>
>
>

You may want to check the man page for emerge.  I don't think -n is what
you think it is.  From the man page:


--noreplace, -n Skips the packages specified on the command-line that
have already been installed.  Without this option, any package atoms or
package sets you  specify  on  the command-line  will  cause Portage to
remerge the package, even if it is already installed.  Note that Portage
will not remerge dependencies by default. This option can be used to
update the world file without rebuilding the packages.


Here's another.


--update, -u  Updates packages to the best version available, which may
not always be the highest version number due to masking for testing 
and  development.  Package  atoms specified  on the command line are
greedy, meaning that unspecific atoms may match multiple versions of
slotted packages.  This option also implies the --selective option.


I've been using Gentoo since about 2003.  Over the years, I've learned
some ways to keep as sane a install as possible even when running some
keyworded packages.  Between the command line options and default
options set in make.conf, this is what it ends up looking like: 

emerge --newuse --oneshot --unordered-display --update --ask
--backtrack=100 --deep --jobs=5 --keep-going --with-bdeps=y
--reinstall=changed-use --quiet-build=n --regex-search-auto=y --usepkg

As far as I know, all those options are still valid.  I haven't checked
into it in a while tho.  When I finish a sync and issue the command, I
do this:


emerge -aUDN world


Each person has their own needs but if you check into those options, you
may find them working for you as well.  From make.conf:


EMERGE_DEFAULT_OPTS="--with-bdeps y --backtrack=100 --keep-going -v -j5
--quiet-build=n -1 --unordered-display"


To me, the most important option is the -1, --oneshot, option.  It helps
keep the world file from getting cluttered. 

Hope that helps.  If you need more info, just ask.  I may have to make a
change myself if something has changed how it is used. 

Dale

:-)  :-) 

Re: [gentoo-user] what's the difference between the emerge options -u and -n?

[Peter Humphrey]

On Saturday, 28 November 2020 20:00:01 GMT n952162 wrote:
> Assuming no "emerge --sync" has been done, e.g.
> 
> I've been using -u to mean, "don't update if there's nothing new" (which
> I would actually think would be the default).  Maybe that's wrong?  -n
> is better?

... or did you mean -N?

-- 
Regards,
Peter.