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Redirect produces zero byte file

 
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# 1  
Old 01-11-2010
Redirect produces zero byte file
I my shell script I call a program and redirect the output to a file.
mypgm > myoutput.file
Once in a while, the output file is zero byte.
The programmer of mypgm said the program always produce some output.
Is there any situation where a redirect will create a zero byte file even if the program actually output something. I want to be sure before I go back to challenge the programmer.
# 2  
Old 01-11-2010
Possibility 1: If the partition is full.
When you try to create a file you will be given an alert for that.

Possibility 2: Something truncated your file.
Instead of myprg > myoutput, you/some other process/somebody else given just '>myoutput'.

Possibility 3: The program itself not produced output.
In some situations/conditionals the program itself have not created any output, you could execute without redirection or with the help tee.
# 3  
Old 01-11-2010
Hi.

Two possible causes:
  • No space on device (full filesystem)
  • The program outputs only to standard error (you're only directing standard output to a file). Have a look at the script for 2> redirections
Try changing how you call the program:
Code:
myprg > myoutput.file 2>&1

Without seeing at least some portion of the script which is supposed to write output...
# 4  
Old 01-18-2010
Thanks for the very helpful answers. Yes, there was an error which we can see only by also redirecting stderr.
 
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