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Full Discussion: command output to variable assignment and screen simultaneously
Top Forums Shell Programming and Scripting command output to variable assignment and screen simultaneously Post 302357166 by mbm on Tuesday 29th of September 2009 01:07:20 AM
Old 09-29-2009
Quote:
Originally Posted by jlliagre
Code:
output=$(time /usr/local/bin/rsync -via /path/to/sync/ rsync://host1/destination" 2>&1 | tee /dev/tty)

Thanks jlliagre,

Man, talk about the forest hiding the trees! I tested this out, and it works great. I did have two hurdles. I'll explain them as others might have the same issues.

1) Wanted tty to be specified dynamically, and I tried originally with...
Code:
output=$(... | tee $(tty))

...but it wouldn't eval as the subshell wasn't attached to the tty. The obvious workaround was to set the tty to a variable first, then call it in the tee command:
Code:
tty=$(tty)
output=$(... | tee ${tee})

2) Since piping to tee yields a return code of 0 even if the rsync command fails, I have another isssue. Since I'm using Posix Shell and not BASH in HPUX, I don't have access to $PIPESTATUS.

Instead, I gathered the idea to prefix the rsync command with a trap to let me know if it failed like so:
Code:
output=$((trap 'RSYNC ERROR: $?' ERR && time /usr/local/bin/rsync -via /path/to/sync/ rsync://host1/destination) 2>&1 | tee ${tty})

Later on in the code, I can echo "${output}" | grep 'RSYNC ERROR' and parse out the return code if necessary.
 

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LEARN ABOUT SUSE

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

       --help display this help and exit

       --version
	      output version information and exit

       If a FILE is -, copy again to standard output.

AUTHOR

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

REPORTING BUGS

       Report tee bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>

COPYRIGHT

       Copyright (C) 2009 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

       The  full  documentation  for tee is maintained as a Texinfo manual.  If the info and tee programs are properly installed at your site, the
       command

	      info coreutils 'tee invocation'

       should give you access to the complete manual.

GNU coreutils 7.1						     July 2010								    TEE(1)
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