CNSHD103243 Re: STSDAS programming help

Help@stsci.edu wrote on Jun 24, 1999

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Current call log entry : Shel,
   
   I created a 'child call' from our previous discussion, because it was
   getting to be too long a message for our 'help' logging software to 
   handle gracefully.
   
   > How long have you been working with IRAF?   
   I have been using IRAF for > 11 years.  
   
   I learned about 'ukey' after I had communicated with you, and countless
   others on the adass-exploder email address that you use.
   
   Your 'final' program looks darn respectable!  Good work!
   
   I noticed that you added 'delete' lines to clean up temporary files and
   that you direct all output to dev$null.  This can be dangerous because
   you won't see error messages, if for example, you attempted to delete
   a file that did not exist or you didn't have permission to delete.
   
   > delete (tempmean, ver-, >& "dev$null")
   
   In my scripts I check for the existance of a file before I try to
   delete.  This way you can be certain that the file actually was
   created.  This makes debugging esier.  
   
   Here is a snippet from a script of mine that does that:
   
   if (access(ellip)){
           imdel (ellip,
           yes, verify=no, default_acti=yes)
           print ("Found and deleted "//ellip//", the old ellipse image.")
                     }
   
   Eric

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Last post on Jun 24, 1999