Ruby - Call system command in double-quoted strings

Introduction

You can also embed commands inside double-quoted strings like this:

Demo

print( "Goodbye #{%x{dir main.rb}}" ) 

print( "Goodbye #{%x{ruby}}" )

Result

The command itself is evaluated first.

Your Ruby program then waits until the process that starts has terminated.

Related Topic

• String
• String across multiple lines
• String Expressions
• String literal single quote vs double quote
• Using embedded evaluation in double-quoted strings
• Doing math in double-quoted string
• String in Backquotes
• String in comma
• String indexed using negative values
• Record separator $/
• Modifying Receivers and Yielding New Objects

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