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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

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[Message index]

		Re: cd to nonexistent directory and up again By: David Fanning on Tue, 16 October 2012 06:31
		Re: cd to nonexistent directory and up again By: Paul Van Delst[1] on Tue, 16 October 2012 06:13
		Re: cd to nonexistent directory and up again By: Paul Van Delst[1] on Tue, 16 October 2012 05:55
		Re: cd to nonexistent directory and up again By: Lajos Foldy on Tue, 16 October 2012 04:42

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