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Shell Programming and Scripting

Breaking a pipe

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# 1  
Old 06-27-2013
Breaking a pipe
Here's my code -

Code:
for File in "${Files}"; do 
    uuencode "${File}" "$(basename ${File} 2>&-)" 2>&-; 
done | mailx -s "subject" "a@b.c"

Now I want to know if there a way to *not* send an email if the "Files" variables turns out to be blank. Any suggestions?

Also, just to clarify, I was looking for a way to "break" the pipe (advanced stuff) & not the basic variable-check stuff. Thanks!
# 2  
Old 06-27-2013
A pipe "breaks" if the reading end closes first -- next time anything calls write() on the write-end, it will be given the SIGPIPE cleanup signal and die. There's no mechanism for the opposite direction.
# 3  
Old 06-27-2013
Change all references to it from "$Files" to "${Files:?}" as doing it this way abends command if it is null or not set...
# 4  
Old 06-27-2013
How about just:
Code:
if [ -n "$Files" ]; then
  for File in $Files; do
    ...
  done | ...
fi

There should be no double quotes around the $Files in the for loop..
# 5  
Old 06-27-2013
Thanks! I suspected I'm asking too much Smilie
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