Is "backups" a reserved word for LC server ?

[Richard Gaskin]

jbv wrote:

 >> What are the permissions on the folder?  What do "the result" and
 >> sysError() tell you when called immediately after the line that
 >> fails?
 >
 > I have tried various permissions, especially 755 and 777.

Whenever practical it's generally useful to avoid 777, as that makes the 
file/folder world-writable and world-executable.

 > The result and the syserror return exactly the same values, no matter
 > is the file is written or not :
 > the result is empty
 > the syserror returns 2

I'm surprised that syserror has an integer while "the result" is empty.

2 is "No such file or directory":
<http://www-numi.fnal.gov/offline_software/srt_public_context/WebDocs/Errors/unix_system_errors.html>

Double-check your path and you'll be good to go in no time.

-- 
  Richard Gaskin
  Fourth World Systems
  Software Design and Development for the Desktop, Mobile, and the Web
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