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08.31.2007 at 01:12AM PDT, ID: 22799421
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UNIX Shell script stream output buffering with "tee"

Tags: shell, tee, unix, script
Hi - I have the following script, it appears though that when I pipe the output from do_countdown through any kind of stream filter - sed, grep, tr ..etc, and then through tee that the output is being buffered until do_countdown completes.

Does anyone know why this is, or if there's a workaround? Thanks!


script
=======

#!/bin/sh

COUNT_OUTPUT=./count_out

do_countdown()
{
    COUNT=5
    while [ $COUNT -gt 0 ];
    do
        echo "count $COUNT"
        sleep 1
        COUNT=`expr $COUNT - 1`      
    done
}


do_countdown | tee $COUNT_OUTPUT                # unbuffered ?
do_countdown | tr "[a-z]" "[A-Z]" | tee $COUNT_OUTPUT        # buffered ?

output
=======

count 5
count 4
count 3
count 2
count 1
COUNT 5
COUNT 4
COUNT 3
COUNT 2
COUNT 1
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Question Stats
Zone: Programming
Question Asked By: father-o-seamus
Solution Provided By: Computer101
Participating Experts: 3
Solution Grade: A
Views: 161
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08.31.2007 at 01:41AM PDT, ID: 19806696

Rank: Guru

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10.19.2007 at 05:48PM PDT, ID: 20113351

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10.22.2007 at 01:11AM PDT, ID: 20121475

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01.10.2008 at 08:05AM PST, ID: 20628175

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01.10.2008 at 12:53PM PST, ID: 20631087

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01.14.2008 at 06:23PM PST, ID: 20659580

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