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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 REDHAT

extutils::command

ExtUtils::Command(3pm)					 Perl Programmers Reference Guide				    ExtUtils::Command(3pm)

NAME

       ExtUtils::Command - utilities to replace common UNIX commands in Makefiles etc.

SYNOPSIS

	 perl -MExtUtils::Command -e cat files... > destination
	 perl -MExtUtils::Command -e mv source... destination
	 perl -MExtUtils::Command -e cp source... destination
	 perl -MExtUtils::Command -e touch files...
	 perl -MExtUtils::Command -e rm_f file...
	 perl -MExtUtils::Command -e rm_rf directories...
	 perl -MExtUtils::Command -e mkpath directories...
	 perl -MExtUtils::Command -e eqtime source destination
	 perl -MExtUtils::Command -e chmod mode files...
	 perl -MExtUtils::Command -e test_f file

DESCRIPTION

       The module is used to replace common UNIX commands.  In all cases the functions work from @ARGV rather than taking arguments.  This makes
       them easier to deal with in Makefiles.

	 perl -MExtUtils::Command -e some_command some files to work on

       NOT

	 perl -MExtUtils::Command -e 'some_command qw(some files to work on)'

       Filenames with * and ? will be glob expanded.

       cat Concatenates all files mentioned on command line to STDOUT.

       eqtime src dst
	   Sets modified time of dst to that of src

       rm_rf files....
	   Removes directories - recursively (even if readonly)

       rm_f files....
	   Removes files (even if readonly)

       touch files ...
	   Makes files exist, with current timestamp

       mv source... destination
	   Moves source to destination.  Multiple sources are allowed if destination is an existing directory.

       cp source... destination
	   Copies source to destination.  Multiple sources are allowed if destination is an existing directory.

       chmod mode files...
	   Sets UNIX like permissions 'mode' on all the files.

       mkpath directory...
	   Creates directory, including any parent directories.

       test_f file
	   Tests if a file exists

BUGS

       Should probably be Auto/Self loaded.

SEE ALSO

       ExtUtils::MakeMaker, ExtUtils::MM_Unix, ExtUtils::MM_Win32

AUTHOR

       Nick Ing-Simmons <nick@ni-s.u-net.com>.

perl v5.8.0							    2002-06-01						    ExtUtils::Command(3pm)
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