The following Sass function converts pixels to rem:
@function px-rem($size, $base: 16px) {
@if (unitless($size)) {
$size: $size * 1px;
}
@if (unitless($base)) {
$base: $base * 1px;
}
@return 1rem * ($size / $base);
}
The $size argument can be provided either with or without a px unit, for
example:
font-size: px-rem(18px); /* 1.125rem */
line-height: px-rem(24); /* 1.5rem */
You can provide a second argument to px-rem() if your base font size is not
16 pixels.
Articles tagged with gentoo may not
totally apply to your preferred flavor of Linux.
After installing PostgreSQL 9.5, first setup the initial database environment:
emerge --config dev-db/postgresql:9.5
Next, compare and update the configuration files:
/etc/conf.d/postgresql-9.5/etc/postgresql-9.5/*
If needed, run /etc/init.d/postgresql-9.4 stop to stop the old database
server before proceeding with the upgrade.
Now, switch to the postgres user, and execute pg_upgrade, which does
the hard work. Run it with the --check option first to perform only the
necessary checks without changing any data:
# su - postgres
$ /usr/lib/postgresql-9.5/bin/pg_upgrade \
--old-bindir=/usr/lib/postgresql-9.4/bin/ \
--new-bindir=/usr/lib/postgresql-9.5/bin/ \
--old-datadir=/var/lib/postgresql/9.4/data/ \
--new-datadir=/var/lib/postgresql/9.5/data/ \
--check
(This uses the default paths for the data directories; adjust the command
accordingly if your setup is different.)
If the command runs without errors, execute it again without the --check
flag to perform the actual upgrade. Once it is finished, you can start the
new database server via /etc/init.d/postgresql-9.5 start, do some cleanup
tasks that pg_upgrade might have you prompted for, and verify that
everything works as before. Finally, uninstall the old PostgreSQL version,
and don’t forget to add/delete services from runlevels if necessary.
Articles tagged with gentoo may not
totally apply to your preferred flavor of Linux.
Gentoo’s standard greeting message on the console looks like this:
This is <my_hostname>.<my_domain> (Linux x86_64 4.3.3-gentoo) 12:00:00
While informative, it isn’t really pretty. Modifying it turns out to be quite
easy, though: just edit /etc/issue! By default, it contains:
This is \n.\O (\s \m \r) \t
Simply adjust this to your needs, and you are done. Especially removing .\O
might be of interest, as this gets rid of the ugly .unknown_domain part
which you get in case you don’t have a domain configured.