[LUG]Re: Shell Scripting question

[Paul Sutton via list <list@xxxxxxxxxxxxx>]

Hi Peter & Mr comrade meowski

Thanks for this,  works great,  having several solutions is really 
useful to this.  I have taken peters solution and added some extra code 
to store the appended text in a variable then add it to the new 
filename,  took a bit of experimentation but figured it out.

With the one liner,  I will take a much closer look to see what it is 
doing.

Paul

On 26/12/2024 16:31, Peter Walker via list wrote:
> Hi Paul,
>
> Post Christmas and Boxing Day dinners so no guarantees on details but 
> this is nice and easy to do in bash.
>
> Like everything in Linux there are many ways of doing it so just build 
> from this.
>
> You already have your files in a directory so you  don't want to list 
> them explicitly.
> If we assume we are in the directory then the linux globbing will take 
> care of that.
> Eg.
> ls *.mp3
>
> Globbing just matches filenames based on the pattern you provide.
>
> Your for loop was the right way to go and you just need to feed it the 
> correct list of files. Splitting the file names to make new ones is an 
> extra command so the easy option is to create a new directory (new) to 
> copy to and use the original names.
>
>
> for file in *.mp3
> do
>      ffmpeg -i $file -c copy -an new/${file}
> done
>
> To make it work with new file names we need an extra step.
>
> for file in *.mp3
> do
>      filename="${file%.*}"
>      ffmpeg -i $file -c copy -an ${filename}-ns.mp3
> done
>
> As I said, there are lots of ways of doing this sort of think. Google 
> xargs and bash scripting for more.
>
> Cheers,
> Pete
>
>
> On 26/12/2024 11:37, zleap via list wrote:
> > Hi, all
> >
> > I am trying to write a shell script to auto mate a task of stripping 
> > sound from some video files,  as I am fairly new to writing scripts I 
> > have so far found part of a solution
> >
> > I have modified this
> > #!/bin/bash
> > echo Create files listed in an array with the touch command
> > files=(
> >   # list of files to create
> >   "file1.txt"
> >   "file2.txt"
> >   "file3.txt"
> > )
> >
> > # Loop to create each file
> > for filelist in "${files[@]}"; do
> >   touch "$filelist"
> > done
> >
> > To include the target file names in the array
> >
> > The following will strip from a single file
> >
> > ffmpeg -i 20OCT5.mp4 -c copy -an 20OCT5-ns.mp4
> >
> > So far I have modified so it applies the source file(s) listed in the 
> > array
> >
> > ffmpeg -i $filelist -c copy -an 20OCT5-ns.mp4
> >
> > I am not sure what to put in to tell the script to slightly modify the 
> > filename so the output file is modified for example
> >
> > if the inputfile is
> > video.mp4 the output file with sound stripped is something like video- 
> > ns.mp4
> >
> > Can anyone advise further please, it is probably fairly simple for 
> > someone with more shell scripting experience.
> >
> > Thanks
> >
> > Paul

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Paul Sutton, Cert Cont Sci (Open)
https://personaljournal.ca/paulsutton/
Mastodon : @zleap@xxxxxxxx
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