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Full Discussion: Shell script to check a command executed sucessfully or not
Top Forums UNIX for Beginners Questions & Answers Shell script to check a command executed sucessfully or not Post 303043519 by rbatte1 on Thursday 30th of January 2020 09:15:04 AM
Old 01-30-2020
It might be that you are not getting output but actually it is errors being displayed. Standard output (good things you want to see) are written to file descriptor 1. Standard errors (bad things that you usually want to see) are written to file descriptor 2. Both of these are usually directed to the screen, but I think you are wanting to ignore some of them.

You might try directing your error output elsewhere. Some examples of this could be:-
Code:
some_command  2>  /tmp/error_file    # Save the errors to this file
some_command  2>  /dev/null          #  Actually I don't care, just bin them
some_command  2>  &1                 # Redirect errors to standard output

This last one can be useful if you want to consider the messages returned.


Does that get you moving?




Kind regards,
Robin
 

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LEARN ABOUT XFREE86

tee

TEE(1)								   User Commands							    TEE(1)

NAME

       tee - read from standard input and write to standard output and files

SYNOPSIS

       tee [OPTION]... [FILE]...

DESCRIPTION

       Copy standard input to each FILE, and also to standard output.

       -a, --append
	      append to the given FILEs, do not overwrite

       -i, --ignore-interrupts
	      ignore interrupt signals

       -p     diagnose errors writing to non pipes

       --output-error[=MODE]
	      set behavior on write error.  See MODE below

       --help display this help and exit

       --version
	      output version information and exit

   MODE determines behavior with write errors on the outputs:
       'warn' diagnose errors writing to any output

       'warn-nopipe'
	      diagnose errors writing to any output not a pipe

       'exit' exit on error writing to any output

       'exit-nopipe'
	      exit on error writing to any output not a pipe

       The default MODE for the -p option is 'warn-nopipe'.  The default operation when --output-error is not specified, is to exit immediately on
       error writing to a pipe, and diagnose errors writing to non pipe outputs.

AUTHOR

       Written by Mike Parker, Richard M. Stallman, and David MacKenzie.

REPORTING BUGS

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report tee translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       Full documentation at: <http://www.gnu.org/software/coreutils/tee>
       or available locally via: info '(coreutils) tee invocation'

GNU coreutils 8.28						   January 2018 							    TEE(1)
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