fadvise(1) — Linux manual page

FADVISE(1)                    User Commands                    FADVISE(1)

NAME         top

       fadvise - utility to use the posix_fadvise system call

SYNOPSIS         top

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

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

DESCRIPTION         top

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

OPTIONS         top

       -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.

EXIT STATUS         top

       fadvise has the following exit status values:

       0
           success

       1
           unspecified failure

AUTHORS         top

       Masatake YAMATO <yamato@redhat.com>

SEE ALSO         top

       posix_fadvise(2)

REPORTING BUGS         top

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

AVAILABILITY         top

       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/>. This page is
       part of the util-linux (a random collection of Linux utilities)
       project. Information about the project can be found at 
       ⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you have a
       bug report for this manual page, send it to
       util-linux@vger.kernel.org. This page was obtained from the
       project's upstream Git repository
       ⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
       2025-08-11. (At that time, the date of the most recent commit that
       was found in the repository was 2025-08-05.) If you discover any
       rendering problems in this HTML version of the page, or you
       believe there is a better or more up-to-date source for the page,
       or you have corrections or improvements to the information in this
       COLOPHON (which is not part of the original manual page), send a
       mail to man-pages@man7.org

util-linux 2.42-start-521-ec46  2025-01-16                     FADVISE(1)

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