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callscan be quite slow, e.g. for videos it will tell you everything about the encoding.-.file, it can take multiple files as arguments.findcommand will prefix./to any filename passed to the shell command; (3) Usinggrepas a test on a singlefilecommand output at a time is the only POSIX way I can see to guarantee correct handling of filenames that may contain newlines.filesupports the--mime-encodingflag and the--separator, neither of which is guaranteed by POSIX.