If the iso file you are writing is the only file in the directory, you
should be able to have it filled in by pressing the tab key immediately
after if=. So dd if=<tab> would fill in the filename, unless you do have
more than one file, in which case, you can tab again and get the list.
If you are typing a letter or two and the tab completion isn't working,
my best guess is that the filename is capitalized and you're typing a
lowercase letter, or else the filename is lowercase and you're typing a
capital letter, in which case, Bash won't correct you. That said,
usb-creator-gtk is probably your best option, as it allows you to choose
exactly the file and device you want.
~Kyle
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