Contents
Can you run a Ruby script from the command line?
Since most Ruby scripts won’t have graphical user interfaces, you’ll be running them from the command line. Thus, you’ll need to know, at the very least, how to navigate the directory structure and how to use pipe characters (such as |, < and >) to redirect input and output.
Do you need Bash to call a shell in Ruby?
If you really need Bash, per the note in the “best” answer. First, note that when Ruby calls out to a shell, it typically calls /bin/sh, not Bash. Some Bash syntax is not supported by /bin/sh on all systems. If you need to use Bash, insert bash -c “your Bash-only command” inside of your desired calling method:
Which is the easiest way to run a loop in Bash?
There are several Bash loop mechanisms. Pick the one which makes your code the easiest to follow. Now we have quite a collection of tools under our belt, we can tackle some more interesting problems. Create a simple script which will print the numbers 1 – 10 (each on a separate line) and whether they are even or odd.
When do you use a loop in Ruby?
Loops in Ruby are used to execute the same block of code a specified number of times. This chapter details all the loop statements supported by Ruby.
Which is the best command to delimit a directory in Ruby?
The first command to learn is the cd command, which will be used to get to the directory where you keep your Ruby files. The command below will change directory to the \\scripts directory. Note that on Windows systems, the backslash character is used to delimit directories but on Linux and OS X, the forward slash character is used.
What can you do with the Ruby prompt?
The interactive Ruby prompt provides an interface to the Ruby language for instant experimentation. This comes in handy while learning Ruby and experimenting with things like regular expressions. Ruby statements can be run and the output and return values can be examined immediately.
Where can I host my code for free?
Heroku is one such service you could use to host your code (in various languages) relatively easily. It offers a freemium model where they let you use about 500 hours of computing for free (their full pricing is here ).