FADVISE(1) FADVISE(1) fadvise - utility to use the posix_fadvise system call fadvise [-a ] [-o ] [-l ] - fadvise [-a ] [-o ] [-l ] -d - fadvise is a simple command wrapping posix_fadvise(2) system call that is for predeclaring an access pattern for file data. -d, --fd - Apply the advice to the file specified with the file descriptor instead of open a file specified with a file name. -a, --advice See the command output with --help option for available values for advice. If this option is omitted, "dontneed" is used as default advice. -o, --offset . , 0. -l, --length . , 0. -h, --help . -V, --version . fadvise : 0 1 Masatake YAMATO posix_fadvise(2) fadvise util-linux, Linux . util-linux 2.41 2025-03-29 FADVISE(1)