command

How do I set the Play Framework 2.6 port in production mode?

Play Framework FAQ: How do I set the Play Framework 2.6 port in production mode?

You set the port that your Play Framework application listens on by passing the http.port parameter to the “run” script for your application:

-Dhttp.port=5150

Here’s an example of a command I use to execute the run script for a Play Framework application named myapp:

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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.

This website is a little one-man operation. If you found this information helpful, I’d appreciate it if you would share it.

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

Linux: How to get the basename from the full filename

As a quick note today, if you’re ever writing a Linux shell script and need to get the filename from a complete (canonical) directory/file path, you can use the Linux basename command like this:

$ basename /foo/bar/baz/foo.txt
foo.txt

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How to list all services on an Ubuntu 16.04 system

Ubuntu FAQ: How do I list all of the services on my Ubuntu 16.04 system from the Linux command line?

Answer: Use this command:

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How to use `curl` to get headers from a URL

Curl FAQ: How do I use curl to get the headers from a website URL?

Short answer: Use curl's -I option, like this:

$ curl -I URL

Here's a specific example, including a real URL and results:

This website is a little one-man operation. If you found this information helpful, I’d appreciate it if you would share it.

How to run external shell commands in SBT (Simple Build Tool)

To run external shell commands in SBT, first start SBT from your operating system command line:

$ sbt

Then run the consoleProject task/command:

> consoleProject

After some output you’ll see this prompt:

scala>

Now you can execute shell commands by including them in double quotes, and following them by an exclamation mark, like this:

scala> "ls -al" !

For more information, see the SBT consoleProject documentation page.

How to run shell commands from the Scala REPL

This is an excerpt from the Scala Cookbook (partially modified for the internet). This is Recipe 14.4, “How to run a shell command from the Scala REPL.”

Problem

You want to be able to run a shell command from within the Scala REPL, such as listing the files in the current directory.

Solution

Run the command using the :sh REPL command, then print the output. The following example shows how to run the Unix ls -al command from within the REPL, and then show the results of the command:

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A Unix find and move command (find in subdirectories)

This is a dangerous Unix command, but if you want to move a bunch of files from their subdirectories into your current directory, this find and mv command works:

find . -type f -exec mv {} . \;

That command finds all files beneath the current directory, and moves them into the current directory. I just moved a bunch of files from their (iTunes) subdirectories into my current working directory, and that find and move command did the trick. (But again, it’s a dangerous command, be careful out there.)