How to execute this brew installed tool 'gigtools'
The syntax is:
gigextract [-v] GIGFILE DESTDIR [SAMPLENR] [ [SAMPLENR] ...]

The following would extract the files in Downloads folder.
gigextract &quot;~/Downloads/myfile.gig&quot; &quot;~/Downloads/&quot;

Optionally add indices of samples you get from
gigdump &quot;~/Downloads/myfile.gig&quot;

A bit more help is at gigextract --help

For multiple files, you can use shell loops like
cd ~/Downloads
for g in *.gig; do gigextract &quot;$g&quot; ./; done

or, if you downloaded a whole directory structure of .gig files,
cd ~/Downloads
find . -name '*.gig' -execdir gigextract '{}' ./ \;

A less elegant way is to create a shell script like extract.sh which contains
cd ~/Downloads
gigextract &quot;myfile.gig&quot; ./
gigextract &quot;myfile2.gig&quot; ./

and run it with sh extract.sh