FADVISE(1) User Commands FADVISE(1)

fadvise - utility to use the posix_fadvise system call

fadvise [-a advice] [-o offset] [-l length] filename

fadvise [-a advice] [-o offset] [-l length] -d file-descriptor

fadvise is a simple command wrapping posix_fadvise(2) system call that is for predeclaring an access pattern for file data.

-d, --fd file-descriptor

Apply the advice to the file specified with the file descriptor instead of open a file specified with a file name.

-a, --advice 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 offset

Specifies the beginning offset of the range, in bytes. If this option is omitted, 0 is used as default advice.

-l, --length length

Specifies the length of the range, in bytes. If this option is omitted, 0 is used as default advice.

-h, --help

Display help text and exit.

-V, --version

Display version and exit.

fadvise has the following exit status values:

0

success

1

unspecified failure

Masatake YAMATO <yamato@redhat.com>

posix_fadvise(2)

For bug reports, use the issue tracker https://github.com/util-linux/util-linux/issues.

The fadvise command is part of the util-linux package which can be downloaded from Linux Kernel Archive https://www.kernel.org/pub/linux/utils/util-linux/.

2025-03-29 util-linux 2.41