| Re: cd to nonexistent directory and up again [message #81702] |
Tue, 16 October 2012 06:31 |
David Fanning
Messages: 11724
Registered: August 2001
|
Senior Member |
|
|
Paul van Delst writes:
> D'oh! FILE_TEST!! I *knew* there was a simpler way!
>
> Thanks!
>
> To the OP: ignore my reply!
I was thinking as I read your earlier post that someone
*really* needs to put together a "Best Practices" web
page. Goodness, people do things in strange ways! ;-)
Cheers,
David
P.S. Of course, this would mean completely banning
the TV command. How far do you think we could get
with that campaign in the astronomy community?
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thue. ("Perhaps thos speakest truth.")
|
|
|
|
|
|
| Re: cd to nonexistent directory and up again [message #81704 is a reply to message #81703] |
Tue, 16 October 2012 05:55  |
Paul Van Delst[1]
Messages: 1157
Registered: April 2002
|
Senior Member |
|
|
On 10/16/12 06:33, tom.grydeland@gmail.com wrote:
> Why is it that this fails:
>
>
> IDL> cd, 'bobo/..' % CD: Unable to change current directory to
> bobo/... No such file or directory
>
> but this does not:
>
> IDL> cd, './bobo/..' IDL>
>
>
> I am using CD to determine whether a given path exists as a
> directory, and I was expecting the second case to fail just like the
> first one does, since there is no difference between them in my
> mind.
This is (slightly) tangential...
Why not use "FILE_SEARCH" to determine path existence? E.g. from one of
my procedures:
dir_list = FILE_SEARCH("Example*", COUNT=n_dirs)
IF ( n_dirs EQ 0 ) THEN $
MESSAGE, 'No "Example*" directories found!'
And, if the possibility of files being confused for directories is
likely, you can then use the FILE_INFO() function to determine which
elements of the above "dir_list" are actual directories, e.g.
IDL> dir_list = FILE_SEARCH("*", COUNT=n_dirs)
IDL> dir_info = FILE_INFO(dir_list)
IDL> help, dir_info.directory
<Expression> BYTE = Array[11]
IDL> print, dir_info.directory
1 1 1 1 1 1 1 1 1 0 0
First 9 entries in "dir_list" are directories, last two are not.
cheers,
paulv
|
|
|
|
| Re: cd to nonexistent directory and up again [message #81707 is a reply to message #81704] |
Tue, 16 October 2012 04:42 |
Lajos Foldy
Messages: 176
Registered: December 2011
|
Senior Member |
|
|
On Tuesday, October 16, 2012 12:33:19 PM UTC+2, tom.gr...@gmail.com wrote:
> Why is it that this fails:
>
>
>
>
>
> IDL> cd, 'bobo/..'
>
> % CD: Unable to change current directory to bobo/...
>
> No such file or directory
>
>
>
> but this does not:
>
>
>
> IDL> cd, './bobo/..'
>
> IDL>
>
>
>
>
>
> I am using CD to determine whether a given path exists as a directory, and I was expecting the second case to fail just like the first one does, since there is no difference between them in my mind.
>
>
>
> Cheers,
>
>
>
> Tom
Both CD's are cd to the current directory, IDL or the underlying OS may optimize it away.
Use file_test('bobo', /dir) instead.
regards,
Lajos
|
|
|
|
comp.lang.idl-pvwave archive
Members
Search
Help
Login
Home
