Table of Contents
How to access the command line arguments in Ruby?
In your Ruby programs, you can access any command-line arguments passed by the shell with the ARGVspecial variable. ARGVis an Array variable which holds, as strings, each argument passed by the shell. This program iterates over the ARGVarrayand prints out its contents: #!/usr/bin/env ruby ARGV.each do|a| puts “Argument: #{a}” end
How to escape a Unicode string with Ruby?
To use a unicode character in Ruby use the “XXXX” escape; where XXXX is the UTF-16 codepoint. see http://leejava.wordpress.com/2009/03/11/unicode-escape-in-ruby/ If you have Rails kicking around you can use the JSON encoder for this:
Which is an example of escaping a string in Ruby?
Besides quotes, there are more symbols we can escape in strings. For example, a newline is represented by . This is called an “escape sequence”. What gets returned is the same string as we created, but as you can see the is highlighted, indicating it’s an escape sequence.
Can a command be run as multiple lines in Ruby?
This can be used by your programs to enable additional tracing. Executes command as one line of Ruby source. Several -e’s are allowed, and the commands are treated as multiple lines in the same program. If program file is omitted when -e is present, execution stops after the -e commands have been run.
To use a unicode character in Ruby use the “\XXXX” escape; where XXXX is the UTF-16 codepoint. see http://leejava.wordpress.com/2009/03/11/unicode-escape-in-ruby/ If you have Rails kicking around you can use the JSON encoder for this:
Are there any commands that use escape characters?
Some commands (e.g. REG and FINDSTR) use the standard escape character of (as used by C, Python, SQL, bash and many other languages.) The escape can cause problems with quoted directory paths that contain a trailing backslash because the closing quote ” at the end of the line will be escaped “.
When do you use the escape character in piping?
When piping or redirectingany of these characters you should prefix with the escape character:& \\ < > ^| e.g. ^\\ ^& ^| ^> ^< ^^ Escaping CR/LF line endings. The^ escape character can be used to make long commands more readable by splitting them into multiple lines and escaping the Carriage Return + Line Feed (CR/LF) at the end of a line:
What happens when you escape a space in the command line?
For example, escaping a space will cause the shell to treat it like a standard space character rather than a special character that separates command-line arguments. Join 425,000 subscribers and get a daily digest of features, articles, news, and trivia.