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Top Forums UNIX for Beginners Questions & Answers How to run a shell script in background without showing in the terminal? Post 302986438 by bdittmar on Friday 25th of November 2016 09:11:30 AM
Old 11-25-2016
Explain !

Quote:
Originally Posted by Meeran Rizvi
Thanks Andrew,Its working as expected
can u explain me this line
Code:
/bin/ping -c 4 -i 0.2 $c$i > /dev/null 2>&1 && echo $c$i is pingable || echo no answer from $c$i

Why are u using /bin , /dev/null 2>&1
plz explain me
Hello:
Code:
1) /bin/ping is the absolute path to the executable

2) The null device is typically used for disposing of unwanted output streams of a process, or as a convenient empty file for input streams. This is usually done by redirection.

3) In a Unix shell, if I want to combine stderr and stdout into the stdout stream for further manipulation, I can append the following on the end of my command: 2>&1

Regards
 

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OMPI-IOF(1)							     Open MPI							       OMPI-IOF(1)

NAME
ompi-iof, orte-iof - Displays a copy of the output streams from a process. NOTE: ompi-iof, and orte-iof are exact synonyms for each other. Using any of the names will result in exactly identical behavior. SYNOPSIS
ompi-iof [ options ] Options ompi-iof will display a copy of the indicated stdout, stderr, and/or stddiag streams from the designated process. -pid | --pid The pid of the mpirun executing the process whose streams are to be copied -stdout | --stdout Display a copy of the specified process' stdout. If no options are specified, this will act as the default -stderr | --stderr Display a copy of the specified process' stderr. -stddiag | --stddiag Display a copy of the specified process' stddiag. -rank | --rank The rank of the process whose output is to be copied. DESCRIPTION
ompi-iof displays a copy of the indicated stdout, stderr, and/or stddiag streams from the designated process. At this time, a ctrl-C must be used to terminate the program. The program will terminate cleanly, telling the associated mpirun to close the requested streams before exiting. SEE ALSO
orterun(1) 1.4.5 Feb 10, 2012 OMPI-IOF(1)
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