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Closing information to stdout‏

 
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# 1  
Old 11-19-2010
Closing information to stdout‏
Hi Guys,

I have a shell script that is being uploaded through the xterm command in a *.scr file. In my shell script I'm using a tool (zap command) for closing windows, eg. xgraph windows. I'm using the following command to avoid getting the closing information in my scr window:

Code:
zap xgraph 2>/dev/null

However, it still appears in my scr window. I thought this could do the trick but doesn't work as I expected. I'd be very grateful if some suggestions or hints could be provided to improve (or change) the above line command to avoid the closing information.

Thanks in advance,

Cheers,
# 2  
Old 11-19-2010
truss or tusc or strace can tell you what it is writing. If stdout, use >/dev/null. If /dev/tty, maybe see man nohup.
# 3  
Old 11-19-2010
Im not familiar with zap, but I'm guessing it's writing to standard out rather than stderr. Try this:

Code:
zap xgraph >/dev/null 2>&1

Which redirects both stdout and stderr to /dev/null.
# 4  
Old 11-20-2010
See if this works:
Code:
( zap xgraph 2>/dev/null )

or perhaps you need to suppress stdout too...
Code:
( zap xgraph 2>/dev/null >&2 )

# 5  
Old 11-20-2010
Thank you guys for your ideas, however I'm still getting the closing information. This is what I got:

Code:
...
... 
 1 = go to the menu     2 = exit the script 
 
2
./sdp.sh: line 6142:  2084 Killed                  suxwigb key=$key perc=$perc xbox=725 ybox=10 wbox=710 hbox=865 label1="TWT [s]" label2="$key" title="Wiggles of $su" windowtitle="Wiggles of $su" va=4 xcur=5 verbose=0 < $su
./sdp.sh: line 6142:   528 Killed                  suximage key=$key perc=$perc xbox=10 ybox=10 wbox=710 hbox=865 label1="TWT [s]" label2="$key" title="VD of $su" windowtitle="VD of $su" verbose=0 legend=1 units=Amplitude < $su

Any additional idea is appreciated,

Thanks again

---------- Post updated at 08:51 AM ---------- Previous update was at 08:13 AM ----------

Guys, this does what I want:

Code:
killall xgraph

After this, I don't receive any kind of messages.

Thanks for your support.

Cheers,

Gery
# 6  
Old 11-20-2010
Maybe terminate them with something that does not log, like a caught signal and exit?

Of run them with the logging redirected to an appropriate, dedicated log file?

One trick to not hear from your children is to make them orphan grandchildren by starting them in a subshell (). For instance, as I recall this does not tell you the pid or exit:
Code:
(
for f in *
do
 fgrep -l DeWoid $f &
done
)

 
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