Execute ruby file from a ruby file

[Greg Ma]

Hi,
I can't find out how can I execute my ruby script from another ruby
file.

This is how I would do it in command line
ruby jobs/eventParser.rb "5454353"

Greg

 

[Kirk Haines]

Hi,
I can't find out how can I execute my ruby script from another ruby
file.

This is how I would do it in command line
ruby jobs/eventParser.rb "5454353"

ri Kernel#system


---------------------------------------------------------- Kernel#system
system(cmd [, arg, ...]) => true or false
------------------------------------------------------------------------
Executes _cmd_ in a subshell, returning +true+ if the command was
found and ran successfully, +false+ otherwise. An error status is
available in +$?+. The arguments are processed in the same way as
for +Kernel::exec+.

system("echo *")
system("echo", "*")

_produces:_

config.h main.rb
*


Kirk Haines

 

[Brian Candler]

I can't find out how can I execute my ruby script from another ruby
file.

This is how I would do it in command line
ruby jobs/eventParser.rb "5454353"

system "ruby", "jobs/eventParser.rb", "5454353"

system "ruby jobs/eventParser.rb 5454353"

The latter is less secure since it passes the string to a shell for
splitting into words, and you have to worry about things like quoting,
but it lets you do redirection and shell pipelines, e.g.

system "ruby jobs/eventParser.rb 5454353 2>/dev/null"

However, it may be an idea to try to write your ruby code in such a way
as it could be used directly from the first ruby program. Then it might
become:

require 'jobs/eventParser'
EventParser.new.run("5454353")

This is more efficient because you don't spawn a whole new ruby
interpreter, and becomes even more efficient if you are repeatedly using
the EventParser object.

jobs/eventParser.rb can be written in such a way as it will work both
ways:

class EventParser
def run(args)
...
end
end
if __FILE__ == $0
EventParser.new.run(ARGV)
end

HTH,

Brian.