[RndTbl] Ksh scripting, named pipes

[Kevin McGregor]

The writer is:
#/bin/ksh
PIPE=/tmp/backup.pipe
[[ ! -a $PIPE ]] && mkfifo $PIPE
# Start gzip processes
/opt/cronjobs/zip1 &
/opt/cronjobs/zip2 &

# Process files needing compression
let 'fc=0'
ls /zonebackup/*tar | while read F; do
        echo $F >$PIPE
        let 'fc=fc+1'
done

echo "end of list" >$PIPE
echo "end of list" >$PIPE
exit 0

The readers are:
#/bin/ksh
PIPE=/tmp/backup.pipe
NAME=zip1
if [[ ! -a $PIPE ]]; then
        logger -p local0.warning "$NAME can't find $PIPE -- exiting"
        exit 1
fi

while (( 1 )); do
        read F <$PIPE
        if [[ "$F" = "end of list" ]]; then
                break
        else
                echo "$NAME: $F"
        fi
done



On Sat, Mar 1, 2014 at 1:29 PM, Kevin McGregor
<kevin.a.mcgregor at gmail.com>wrote:

> I tried fiddling with IFS to no avail. I just changed it like this:
> IFS='
> '
> And now the readers show all kinds of gibberish! All lines have no
> whitespace, save for the newline at the end. I'm assuming it's at the end.
>
>
> On Sat, Mar 1, 2014 at 12:47 PM, Robert Keizer <robert at keizer.ca> wrote:
>
>> Have you tried setting IFS ( field sep )? Also you could enable raw mode
>> with -r.
>>
>> Can you share the script?
>>
>> Are the same lines failing repeatedly?
>>
>> Rob
>> On 2014-03-01 11:55 AM, "Kevin McGregor" <kevin.a.mcgregor at gmail.com>
>> wrote:
>>
>>> I have a main script which writes to a named pipe. Before it starts
>>> writing, it starts two other scripts which read from this pipe. The reading
>>> and writing is a list of file names, one per line. How do I ensure that
>>> each script reads one complete line from the pipe at a time (no more, no
>>> less)?
>>>
>>> I have a test set up, and it usually works, but sometimes a reader will
>>> get a blank line or just a "/" (but not any other part of a line)!
>>>
>>> Kevin
>>>
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>>> Roundtable at muug.mb.ca
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>>>
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>
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