fsync(1)

synchronize a file's in-core state with that on disk

NAME

fsync – synchronize a file's in-core state with that on disk

SYNOPSIS

fsync file ...

DESCRIPTION

The fsync utility causes all the modified data and meta-data of all the files named on the command line to be written to a permanent storage device.

The fsync utility uses the fsync(2) function call.

EXIT STATUS

If an error occurs, the fsync utility proceeds to the next file, and exits >0. Otherwise, it exits 0.

HISTORY

The fsync command first appeared in FreeBSD 4.3.

History

FreeBSD 16.0-CURRENT (2026-10-27) to FreeBSD 13.3-RELEASE: the text shown here
FreeBSD 13.2-RELEASE to FreeBSD 13.0-RELEASE
FreeBSD 12.4-RELEASE
FreeBSD 12.3-RELEASE
FreeBSD 12.2-RELEASE
FreeBSD 12.1-RELEASE
FreeBSD 12.0-RELEASE
FreeBSD 11.4-RELEASE
FreeBSD 11.3-RELEASE
FreeBSD 11.2-RELEASE
FreeBSD 11.1-RELEASE
FreeBSD 11.0-RELEASE
FreeBSD 10.4-RELEASE
FreeBSD 10.3-RELEASE
FreeBSD 10.2-RELEASE
FreeBSD 10.1-RELEASE
FreeBSD 10.0-RELEASE
FreeBSD 9.3-RELEASE
FreeBSD 9.2-RELEASE
FreeBSD 9.1-RELEASE
FreeBSD 9.0-RELEASE
FreeBSD 8.4-RELEASE
FreeBSD 8.3-RELEASE
FreeBSD 8.2-RELEASE
FreeBSD 8.1-RELEASE
FreeBSD 8.0-RELEASE
FreeBSD 7.4-RELEASE
FreeBSD 7.3-RELEASE
FreeBSD 7.2-RELEASE
FreeBSD 7.1-RELEASE
FreeBSD 7.0-RELEASE
FreeBSD 6.4-RELEASE
FreeBSD 6.3-RELEASE to FreeBSD 6.0-RELEASE
FreeBSD 5.5-RELEASE to FreeBSD 5.4-RELEASE
FreeBSD 5.3-RELEASE to FreeBSD 5.0-RELEASE
FreeBSD 4.11-RELEASE to FreeBSD 4.4-RELEASE
FreeBSD 4.3-RELEASE
FreeBSD 4.2-RELEASE to FreeBSD 4.1-RELEASE