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@MichaelRoss curly brackets can be useful when you create files or paths in a script

mkdir -p /mnt/{hdd,ssd,floppy}

and suddenly you have
/mnt/hdd
/mnt/ssd
/mnt/floppy

say you need to create file in each of the directories

touch /mnt/{hdd,ssd,floppy}/if_you_see_this_its_unmounted