Re: How to parallelize find|while read do; ffprobe, grep and get the filenames?

Sat, 12 Nov 2022 07:54:05 -0800 

On Sat, Nov 12, 2022 at 2:55 PM D <dcmhoybdp...@web.de> wrote:
>
> Hello,
>
> I'm trying to parallelize my Bash shell script:
>
> find . -type f -iname "*.flac" -print0 | while read -d $'\0' FILENAME; do
>      INFOS=$(ffprobe -hide_banner "$FILENAME" 2>&1)
>      URL=$("$INFOS"|& grep -i 'http\|www')
>      if [ "$URL" != "" ]; then
>          echo -e "$FILENAME\t$URL"
>      fi
> done | column -t -s $'\t'

doit() {
   FILENAME="$1"
   INFOS=$(ffprobe -hide_banner "$FILENAME" 2>&1)
   URL=$("$INFOS"|& grep -i 'http\|www')
   if [ "$URL" != "" ]; then
       echo -e "$FILENAME\t$URL"
   fi
}
export -f doit
find . -type f -iname "*.flac" -print0 | parallel doit |
   column -t -s $'\t'

I think you have misunderstood how GNU Parallel works.

You should spend 20 minutes reading chapter 1+2:
https://doi.org/10.5281/zenodo.1146014 (Print:
https://www.lulu.com/shop/ole-tange/gnu-parallel-2018/paperback/product-23558902.html)

/Ole

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