commands

How to create a Scala 3 (Dotty) project with SBT

I can never remember how to create a Scala 3 (Dotty) project with SBT (in early 2019), so:

# create a new Dotty project
sbt new lampepfl/dotty.g8

# create a dotty project that cross compiles with scala 2
sbt new lampepfl/dotty-cross.g8

# start a dotty reply from within your sbt project
$ sbt

> console
scala> _

More information: dotty.epfl.ch/docs/usage/getting-started.html

A Drush 9 list of commands (for Drupal 8)

I’m sure there’s something I’m missing here, but ... as I’m just getting started using Drush 9 to manage a Drupal 8 website, I can’t find a list of Drush 9 commands on the drush.org website. Therefore, in an effort to make my life easier (and hopefully yours), here’s a list of Drush 9 commands.

You can run the `javap` command inside the Scala REPL

As shown in the image, I was just reminded that you can run javap inside the Scala REPL. The REPL help command shows some other things you can do:

scala> :help

All commands can be abbreviated, e.g., :he instead of :help.
:edit <id>|<line>        edit history
:help [command]          print this summary or command-specific help
:history [num]           show the history (optional num is commands to show)
:h? <string>             search the history
:imports [name name ...] show import history, identifying sources of names
:implicits [-v]          show the implicits in scope
:javap <path|class>      disassemble a file or class name
:line <id>|<line>        place line(s) at the end of history
:load <path>             interpret lines in a file
:paste [-raw] [path]     enter paste mode or paste a file
:power                   enable power user mode
:quit                    exit the interpreter
:replay [options]        reset the repl and replay all previous commands
:require <path>          add a jar to the classpath
:reset [options]         reset the repl to its initial state, forgetting all session entries
:save <path>             save replayable session to a file
:sh <command line>       run a shell command (result is implicitly => List[String])
:settings <options>      update compiler options, if possible; see reset
:silent                  disable/enable automatic printing of results
:type [-v] <expr>        display the type of an expression without evaluating it
:kind [-v] <type>        display the kind of a type. see also :help kind
:warnings                show the suppressed warnings from the most recent line which had any

Free Unix/Linux and vi/vim cheat sheets

Way back in the 1990s I created some “cheat sheets” for Unix training classes that I taught. Somewhere in the 2000s I updated them to make sure they worked with Linux as well, Here then are two Unix/Linux cheat sheets I created (way back when) that you can print out if you’re just learning Linux and the vi/vim editor:

Fun ‘git’ commands alvin May 30, 2017 - 11:39am

This article titled, Little things I like to do with git, has a fun series of git commands.

Mac OS X performance tuning tools and commands alvin March 23, 2014 - 9:24pm

Mac OS X performance tuning tools and commands. From this tweet by Brendan Gregg.