Change windows drive

ruby-talk
1

I need to get access to my D: drive through command line to do certain
actions... I tried to do many things but it seems like it says
permission denied when changing the drive using ruby:
`d:`

any clue how can i do this?
thanks

···

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Posted via http://www.ruby-forum.com/.

2

What exactly did you do? And does the user have permissions on the
folder in question?

Kind regards

robert

···

On Wed, Nov 13, 2013 at 12:50 PM, Mario Ruiz <lists@ruby-forum.com> wrote:

I need to get access to my D: drive through command line to do certain
actions... I tried to do many things but it seems like it says
permission denied when changing the drive using ruby:
`d:`

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

3

irb(main):001:0> Dir.pwd
=> "C:/Users/Joel"
irb(main):002:0> Dir.chdir 'E:/'
=> 0
irb(main):003:0> Dir.pwd
=> "E:/"

···

--
Posted via http://www.ruby-forum.com/.

4

Yes the user has permissions.
I need run a process going first to the folder so what i need to do is
from Ruby:
D:
cd d:/myrootfolder/
/folder1/myprocess.exe

This is done actually in a ruby thread

···

--
Posted via http://www.ruby-forum.com/.

5

Of course not.. i was just explaining, what i do is like this more or
less:

`
D:
cd d:/myrootfolder/
/folder1/myprocess.exe
`

Error:
Permission denied, even when doing just `D:`
so it seems it is not possible in ruby to select the drive in command
line

···

--
Posted via http://www.ruby-forum.com/.

6

I'm not exactly sure what's going on here, but it sort of looks like Ruby
is trying to *run* `D:` in some way. At first I thought maybe the backtick
operator just assumed the first word was the name of an executable file,
but then I found out that you can do `cd /d D:` (`cd` is built in to
Windows's cmd.exe, not a separate file). Then I wondered if maybe cmd.exe
didn't accept `D:` on its command line, but--sure enough--`cmd /k D:` works
fine.

I also noticed the backtick operator only seems to read up to the first
newline. You have to use `&&` between the Windows commands. E.g.:

    `cd /d D: && cd d:/myrootfolder/ && /folder1/myprocess.exe`

But I'm unclear as to why you don't use Ruby's Dir class methods to change
drives/directories.

···

On Wed, Nov 13, 2013 at 11:33 AM, Mario Ruiz <lists@ruby-forum.com> wrote:

Of course not.. i was just explaining, what i do is like this more or
less:

`
D:
cd d:/myrootfolder/
/folder1/myprocess.exe
`

Error:
Permission denied, even when doing just `D:`
so it seems it is not possible in ruby to select the drive in command
line

--
Posted via http://www.ruby-forum.com/\.

7

Yes the user has permissions.
I need run a process going first to the folder so what i need to do is
from Ruby:
D:
cd d:/myrootfolder/
/folder1/myprocess.exe

This is done actually in a ruby thread

Certainly not - this isn't even valid Ruby code:

$ ruby -c <<CODE

D:
cd d:/myrootfolder/
/folder1/myprocess.exe
CODE

-:1: syntax error, unexpected ':', expecting $end

So what did you _really_ do? And what error message did you get?

Cheers

robert

···

On Wed, Nov 13, 2013 at 4:15 PM, Mario Ruiz <lists@ruby-forum.com> wrote:

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

8

Of course not.. i was just explaining, what i do is like this more or
less:

`
D:
cd d:/myrootfolder/
/folder1/myprocess.exe
`

Error:
Permission denied, even when doing just `D:`
so it seems it is not possible in ruby to select the drive in command
line

I'm not exactly sure what's going on here, but it sort of looks like Ruby is
trying to *run* `D:` in some way. At first I thought maybe the backtick
operator just assumed the first word was the name of an executable file, but

Yes, that's most likely what's happening. Ruby needs a program to
execute but "cd" is just an internal command of "cmd". It's probably
better to do something like

system("cmd", "/c", "cd /d d:/myrootfolder && d:/folder1/myprocess.exe")

maybe also this works

system("cd /d d:/myrootfolder && d:/folder1/myprocess.exe")

then I found out that you can do `cd /d D:` (`cd` is built in to Windows's
cmd.exe, not a separate file). Then I wondered if maybe cmd.exe didn't
accept `D:` on its command line, but--sure enough--`cmd /k D:` works fine.

I also noticed the backtick operator only seems to read up to the first
newline. You have to use `&&` between the Windows commands. E.g.:

    `cd /d D: && cd d:/myrootfolder/ && /folder1/myprocess.exe`

"cd /d" can change drive and directory so only one "cd" is needed (see above).

But I'm unclear as to why you don't use Ruby's Dir class methods to change
drives/directories.

Same here.

Kind regards

robert

···

On Wed, Nov 13, 2013 at 9:15 PM, Eric Christopherson <echristopherson@gmail.com> wrote:

On Wed, Nov 13, 2013 at 11:33 AM, Mario Ruiz <lists@ruby-forum.com> wrote:

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/

9

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···

On Nov 13, 2013, at 3:15 PM, Eric Christopherson <echristopherson@gmail.com> wrote:

On Wed, Nov 13, 2013 at 11:33 AM, Mario Ruiz <lists@ruby-forum.com> wrote:
Of course not.. i was just explaining, what i do is like this more or
less:

`
D:
cd d:/myrootfolder/
/folder1/myprocess.exe
`

Error:
Permission denied, even when doing just `D:`
so it seems it is not possible in ruby to select the drive in command
line

--
Posted via http://www.ruby-forum.com/\.

I'm not exactly sure what's going on here, but it sort of looks like Ruby is trying to *run* `D:` in some way. At first I thought maybe the backtick operator just assumed the first word was the name of an executable file, but then I found out that you can do `cd /d D:` (`cd` is built in to Windows's cmd.exe, not a separate file). Then I wondered if maybe cmd.exe didn't accept `D:` on its command line, but--sure enough--`cmd /k D:` works fine.

I also noticed the backtick operator only seems to read up to the first newline. You have to use `&&` between the Windows commands. E.g.:

    `cd /d D: && cd d:/myrootfolder/ && /folder1/myprocess.exe`

But I'm unclear as to why you don't use Ruby's Dir class methods to change drives/directories.

10

Eric Christopherson wrote in post #1127226:

···

On Wed, Nov 13, 2013 at 11:33 AM, Mario Ruiz <lists@ruby-forum.com> > wrote:

Thanks Eric this worked!!!
I don't use the Dir class because it changes also then the Dir for the
execution of the current code that is in a Sinatra... so changes also
the references to libraries and everything... :slight_smile:

Thanks again

--
Posted via http://www.ruby-forum.com/\.

11

I’m a bit unclear on the issues, but couldn’t you do this:

Dir.chdir("d:/myrootfolder/") do |rootfolder|
  `/folder/myprocess.exe`
end

?

···

On Nov 14, 2013, at 4:12 AM, Mario Ruiz <lists@ruby-forum.com> wrote:

Eric Christopherson wrote in post #1127226:

On Wed, Nov 13, 2013 at 11:33 AM, Mario Ruiz <lists@ruby-forum.com> >> wrote:

Thanks Eric this worked!!!
I don't use the Dir class because it changes also then the Dir for the
execution of the current code that is in a Sinatra... so changes also
the references to libraries and everything... :slight_smile:

Thanks again

--
Posted via http://www.ruby-forum.com/\.

12

Remedy for that would be to fork the process, chdir and then exec:

$ ruby -e 'p Dir.pwd; fork { Dir.chdir("/"); exec("bash", "-c",
"pwd")}; p Dir.pwd'
"/tmp"
"/tmp"
$ /

Instead of "bash" you would execute your program. If you need to wait
for termination you can do

$ ruby -e 'p Dir.pwd; ch = fork { Dir.chdir("/"); exec("bash", "-c",
"pwd")}; p Dir.pwd; Process.wait ch'
"/tmp"
"/tmp"
/

Kind regards

robert

···

On Thu, Nov 14, 2013 at 11:12 AM, Mario Ruiz <lists@ruby-forum.com> wrote:

Eric Christopherson wrote in post #1127226:

On Wed, Nov 13, 2013 at 11:33 AM, Mario Ruiz <lists@ruby-forum.com> >> wrote:

Thanks Eric this worked!!!
I don't use the Dir class because it changes also then the Dir for the
execution of the current code that is in a Sinatra... so changes also
the references to libraries and everything... :slight_smile:

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/