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From: Theo v. Werkhoven on 14 Apr 2010 15:37
The carbonbased lifeform houghi inspired comp.unix.shell with:
> Bill Marcum wrote:
>> On 2010-04-09, houghi <houghi(a)houghi.org.invalid> wrote:
>>> I have the following script:
>>> #v+
>>> #!/bin/bash
>>> set -x
>>> COUNT=0
>>> youtube-dl -g -e -b $URL |while read LINE
>>> do
>>> if [ "$COUNT" == "0" ]
>>> then
>>> TITLE=$LINE
>>> COUNT=1
>>> else
>>> LINK=$LINE
>>> echo $LINK
>>> fi
>>> done
>>> echo ${TITLE}.flv
>>> echo $LINK
>>> #v-
>>>
>>>
>>> My question is why does it do the echo with the first $LINK but not with
>>> the second? As far as I can see LINK gets a value (as well as TITLE),
>>> yet at the end they are somehow empty. What am I doing wrong?
>>>
>> The loop is in a pipe, so it's in a subshell.
>
> So what is the solution? I could write the values to a temporary file,
> but I like to avoid that. So the obvious solution would be not to use a
> pipe.
>
> What I actualy want is the following: `youtube-dl -g -e -b $URL` gives
> me output in two lines. The first line will have a lot of spaces in it.
> $TITLE should get that value. The second line won't have any spaces in
> it. $LINK should get that value.

Have you thought of using something differnt than shell script?
E.g., in Python:
#v+
>>> from commands import getoutput
>>> URL = "http://www.youtube.com/watch?v=qkUzITnV3rA"
>>> Title, Link = getoutput("/usr/bin/youtube-dl -g -e -b " + URL).split('\n')
>>> Title
'Rihanna Vs UB 40 - Rude Boy Vs Kingston Town (Djs From Mars Bootleg Remix)'
>>> Link
'http://v9.lscache4.c.youtube.com/videoplayback?ip=0.0.0.0&sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Calgorithm%2Cburst%2Cfactor%2Coc%3AU0dWRlJUVF9FSkNNNl9KTlhJ&algorithm=throttle-factor&itag=35&ipbits=0&burst=40&sver=3&expire=1271296800&key=yt1&signature=19D1054A716230623E45D0109515CA5099F26ED9.C50B835B55EB4729832296E438C5D17BD88F529A&factor=1.25&id=aa45332139d5deb0'
#v-

No need for loops, sub-shells or if..thens

Theo
--
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