Which Directory was my ruby script run from?

ruby-talk
1

Hi All,

How do I find out which directory my ruby script was run from?

Thanks Matthew John
p.s Today I'm using Windows

···

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2

Try:

File.dirname($PROGRAM_NAME)

James Edward Gray II

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On Jan 20, 2006, at 7:52 AM, Matthew John wrote:

Hi All,

How do I find out which directory my ruby script was run from?

Thanks Matthew John
p.s Today I'm using Windows

3

Matthew John wrote:

Hi All,

How do I find out which directory my ruby script was run from?

Maybe Dir.getwd?

------------------------------------------------------------- Dir::getwd
     Dir.getwd => string
     Dir.pwd => string

···

------------------------------------------------------------------------
     Returns the path to the current working directory of this process
     as a string.

        Dir.chdir("/tmp") #=> 0
        Dir.getwd #=> "/tmp"

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4

Mike Fletcher wrote:

Matthew John wrote:

Hi All,

How do I find out which directory my ruby script was run from?
   
Maybe Dir.getwd?

------------------------------------------------------------- Dir::getwd
    Dir.getwd => string
    Dir.pwd => string
------------------------------------------------------------------------
    Returns the path to the current working directory of this process
    as a string.

       Dir.chdir("/tmp") #=> 0
       Dir.getwd #=> "/tmp"

I use File.dirname($0).

Jamey Cribbs

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5

I've written a little script to test, and it looks like the second reply
by Mike is the only one that works. The other two provide me with the
location of the file, not the directory where the file was run from.

My script is in c:\sparkdriver\bin and this is set in my path.

When I run the the testfile.rb script from the c:\Documents and Settings
folder I get the following results:-

C:\Documents and Settings>testfile.rb
Physical Location of File c:\sparkdriver\bin

c:/sparkdriver/bin - File.dirname($PROGRAM_NAME)
C:/Documents and Settings - Dir.getwd
c:/sparkdriver/bin - File.dirname($0)

---- testfile.rb

puts "Physical Location of File c:\\sparkdriver\\bin\n\n"

dir = File.dirname($PROGRAM_NAME)
puts dir + ' - File.dirname($PROGRAM_NAME)'

dir = Dir.getwd
puts dir + ' - Dir.getwd'

dir =File.dirname($0)
puts dir + ' - File.dirname($0)'

Thanks for your help.

Matthew John

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6

I've written a little script to test, and it looks like the
second reply by Mike is the only one that works. The other
two provide me with the location of the file, not the
directory where the file was run from.

Excellent! I love seeing posters get resourceful with the
answers they receive! This makes me happy. :slight_smile:

Yes, File.dirname and Dir.getwd do two very different things,
which you discovered. There seems to have been a small
misunderstanding.

File.dirname simply does string manipulation on its argument,
whereas Dir.getwd actually gets the directory from which the
current script ($0) was invoked... which is what you were asking
for.

BTW, $0 and $PROGRAM_NAME are aliases for the same variable.

Thanks for your help.

Thank you for making the most of the help offered!

Cheers!
Tim Hammerquist

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Matthew John <mj@mjcltd.net> wrote:

7

Tim Hammerquist wrote:

BTW, $0 and $PROGRAM_NAME are aliases for the same variable.

"__FILE__", too, I guess

8

Gene Tani wrote:

Tim Hammerquist wrote:

BTW, $0 and $PROGRAM_NAME are aliases for the same variable.

"__FILE__", too, I guess

Nope. __FILE__ is the name current source file, which can be different
than $0 in different modules.

freebie:~ 839> ruby aprog.rb
$0: aprog.rb
__FILE__: ./amodule.rb
aprog $0: aprog.rb
aprog __FILE__: aprog.rb
freebie:~ 840> cat aprog.rb
#!/usr/local/bin/ruby
require 'amodule'

f = Foo.new

f.pr_dollar0
f.pr_file

puts "aprog $0: #{$0}"
puts "aprog __FILE__: #{__FILE__}"

exit 0

__END__
freebie:~ 841> cat amodule.rb
class Foo
  def pr_file
    puts "__FILE__: #{__FILE__}"
  end
  def pr_dollar0
    puts "$0: #{$0}"
  end
end

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9

"Gene Tani" <gene.tani@gmail.com> writes:

Tim Hammerquist wrote:

BTW, $0 and $PROGRAM_NAME are aliases for the same variable.

"__FILE__", too, I guess

No, __FILE__ is the current file, while $0 is the script ruby was
started with.

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