In a project I'm working on I ran into the requirement of having some sort of persistent FIFO buffer or pipe in Linux, i.e. something file-like that could accept writes from a process and persist it to disk until a second process reads (and acknowledges) it. The persistence should be both across process restarts as well as OS restarts.
AFAICT unfortunately in the Linux world such a primitive does not exist (named pipes/FIFOs do not persist
Mosh (mobile shell) is a gift from the Gods(tm). Anyone with spotty internet or wireless connection has suffered the pain of a lost SSH session. Sure, one can fire up screen (or tmux as the kids are using these days), but that's an extra step and you are still using the SSH protocol.
I'm not here to tout the benefits of Mosh, you came here to open it up in your firewall.
/etc/firewalld/services/mosh.xmlfirewall-cmd --add-service=mosh --permanentfirewall-cmd --reloadIf you tend to have a lot of sessions (not recommended), you can increase the ports, but the default should be fine for most applications.
| trait Foo { | |
| def a: String | |
| val b = a + " " | |
| } | |
| class Bar extends Foo { override val a = "a" } | |
| class Baz extends Foo { override def a = "a" } | |
| class Bla extends Foo { override lazy val a = "a" } | |
| // guess what the code below prints | |
| println(new Bar().b) |