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How to ignore No such file or directory on the output?


 
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# 1  
Old 04-29-2020
How to ignore No such file or directory on the output?

Hello -
I have a script which looks for filesystem usage and its a common script for all servers I have . On few servers, we do not have a FS available and getting the output as
Code:
No such file or directory

, which is expected. I am not in favor of having an if condition to have list of servers added and verify for that specific FS only on those servers.

wondering if there is a way I can ignore this error to show-up on output itself when someone run that script?
Noe - I write the output of the script to a temp txt file and use it for different purpose.
# 2  
Old 04-29-2020
Hi
Try closing the stderr descriptor at the beginning of the script.
Code:
exec 2>&-

or redirect
Code:
exec 2> /dev/null

This User Gave Thanks to nezabudka For This Post:
# 3  
Old 04-29-2020
Quote:
Originally Posted by nezabudka
Hi
Code:
exec 2> /dev/null

This helped. Thank you .
# 4  
Old 04-30-2020
That globally suppresses all error messages.
You can suppress them for specific commands only, for example
Code:
df -kP 2> /dev/null

Suppress the expected.
If unexpected things happen then error messages are helpful, otherwise you might get wrong output silently.
# 5  
Old 05-01-2020
Quote:
Originally Posted by MadeInGermany
That globally suppresses all error messages.
You can suppress them for specific commands only, for example
Code:
df -kP 2> /dev/null

Suppress the expected.
If unexpected things happen then error messages are helpful, otherwise you might get wrong output silently.
Today I am using on that specific line , instead of whole script executing. But
Quote:
If unexpected things happen
this line making me to think , if for some reason that FS is not mounted during patching then I am missing that important message . Any way I can avoid ? I guess answer would be NO.
# 6  
Old 05-01-2020
Quote:
Originally Posted by Varja
Today I am using on that specific line , instead of whole script executing. But this line making me to think , if for some reason that FS is not mounted during patching then I am missing that important message . Any way I can avoid ? I guess answer would be NO.
You could redirect error messages to a (log-)file, for a later review, or to parse for known issues after the 'main' commands.
So instead of >/dev/null you would be using >>/path/to/logfile.

Hope this helps
# 7  
Old 05-01-2020
Try appending this to your command:


Code:
2> >(grep -v 'No such file or directory' >&2)

It should remove the above message from the STDERR but allow other messages to be printed.


Works for bash and I believe ksh, but not sh or dash.



Andrew
These 2 Users Gave Thanks to apmcd47 For This Post:

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