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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 SUNOS

tee

tee(1)								   User Commands							    tee(1)

NAME

       tee - replicate the standard output

SYNOPSIS

       tee [-ai] [file...]

DESCRIPTION

       The  tee  utility  will	copy  standard	input to standard output, making a copy in zero or more files. tee will not buffer its output. The
       options determine if the specified files are overwritten or appended to.

OPTIONS

       The following options are supported.

       -a	Appends the output to the files rather than overwriting them.

       -i	Ignores interrupts.

OPERANDS

       The following operands are supported:

       file	A path name of an output file.	Processing of at least 13 file operands will be supported.

USAGE

       See largefile(5) for the description of the behavior of tee when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

ENVIRONMENT VARIABLES

       See environ(5) for descriptions of the following environment variables that affect the execution of tee: LANG,  LC_ALL,	LC_CTYPE,  LC_MES-
       SAGES, and NLSPATH.

EXIT STATUS

       The following exit values are returned:

       0	The standard input was successfully copied to all output files.

       >0	The number of files that could not be opened or whose status could not be obtained.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       cat(1), attributes(5), environ(5), largefile(5), standards(5)

SunOS 5.10							    20 Dec 1996 							    tee(1)
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