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Full Discussion: Confused over results using "tee" in piped command
Top Forums UNIX for Dummies Questions & Answers Confused over results using "tee" in piped command Post 302596892 by jazzmusic on Wednesday 8th of February 2012 01:54:16 PM
Old 02-08-2012
Confused over results using "tee" in piped command
First post here, so hopefully all guidelines are followed, and thanks in advance for any replies.

I'm working on a shell script(BASH) that processes a csv file and performs various tasks with the data. All is well, except I want to use 'tee' to send output from 'wc' to a file as well as pipe it to 'cut'. What I'm trying to accomplish is a) tally the record count from a list of files, and b) send the details of 'wc' to an output file.

This code successfully tallies the record count, but obviously isn't sending the output from 'wc' to an output file:

Code:
#!/bin/bash	
unset vCount verifyRecordCount
vCount=0
verifyRecordCount=0
   
outfile="./test2a.out"	
EXTRACT_FILES=`ls -d ./*`

for filename in ${EXTRACT_FILES}
do
   `wc -l $filename >> $outfile` 
   vCount=`wc -l $filename | cut -d" " -f1`
   echo "vCount="$vCount>>$outfile
   ((verifyRecordCount=verifyRecordCount+${vCount}))
done
echo "verifyRecordCount="$verifyRecordCount>>$outfile

I then insert a 'tee' into the mix and suddenly the setting of the vCount variable is 'broken'.

Here's the modified code:
Code:
#
# again, with feeling
#
unset vCount verifyRecordCount
vCount=0
verifyRecordCount=0
   
outfile="./test2b.out"
EXTRACT_FILES=`ls -d ./*`

for filename in ${EXTRACT_FILES}
do
   `wc -l $filename >> $outfile` 
   #vCount=`wc -l $filename | cut -d" " -f1`
   vCount=`wc -l $filename | tee >>$outfile | cut -d" " -f1`
   echo "vCount="$vCount>>$outfile
   ((verifyRecordCount=verifyRecordCount+${vCount}))
done
echo "verifyRecordCount="$verifyRecordCount>>$outfile
cat $outfile

I'd paste the results, but since this should run as is, suffice it to say that vCount is not getting set, and is blank.

What am I missing?

Thanks in advance.

Gary
 

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bf_tar

BF_TAR(1)						    Bogofilter Reference Manual 						 BF_TAR(1)

NAME

       bf_tar - shell script to write a tar file of a bogofilter directory to stdout

SYNOPSIS

       bf_tar [-r] [-R] bogofilter_directory

DESCRIPTION

       bf_tar bundles a bogofilter working directory in tar format and copies it to standard output (your console, or where you redirect it, see
       EXAMPLES below).

OPTIONS

       The -r option causes bf_tar to remove inactive log files after the archive has been written successfully. The default is to leave log
       files.

       The -R option causes bf_tar to remove inactive log files before the archive is written. This may reduce chances that the resulting archive
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EXIT STATUS

       The script exits with status code 0 if everything went well, and nonzero if it encountered trouble.

EXAMPLES

       o   bf_tar ~/.bogofilter > outfile.tar

	   Writes a standard .tar file containing the essential files from ~/.bogofilter to outfile.tar.

       o   bf_tar ~/.bogofilter | gzip -9 -c > outfile.tar.gz

	   Writes a gzipped .tar.gz file containing the essential files from ~/.bogofilter to outfile.tar.gz.

       o   bf_tar `pwd`/mydirectory > outfile.tar

	   Prepend $(pwd)/ or `pwd`/ if you want to specify an absolute path instead of a relative path.

NOTES

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       This script requires a SUSv2 compliant pax utility.

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Bogofilter							    10/22/2012								 BF_TAR(1)
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