diff options
Diffstat (limited to 'bin/sync/sync.8')
| -rw-r--r-- | bin/sync/sync.8 | 33 |
1 files changed, 29 insertions, 4 deletions
diff --git a/bin/sync/sync.8 b/bin/sync/sync.8 index 7f331f1222e3..fcd07ca72240 100644 --- a/bin/sync/sync.8 +++ b/bin/sync/sync.8 @@ -26,10 +26,7 @@ .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" -.\" @(#)sync.8 8.1 (Berkeley) 5/31/93 -.\" $FreeBSD$ -.\" -.Dd May 31, 1993 +.Dd April 25, 2024 .Dt SYNC 8 .Os .Sh NAME @@ -72,3 +69,31 @@ A .Nm utility appeared in .At v4 . +.Pp +On systems older than +.Bx 4.0 , +commands like +.Xr reboot 8 +and +.Xr halt 8 +were unavailable. +The shutdown procedure involved running +.Nm , +waiting for the lights to stop, +and turning off the machine. +.Pp +Issuing three separate +.Nm +commands (one line each) was a placebo that would generally suffice in +.At v7 +machines that were otherwise quiesced systems. +It replaced the one-per-line +.Nm +as a substitute for waiting. +.Pp +.Bx 4.0 +introduced +.Xr reboot 2 +and +.Xr sync 2 +which rendered this trick obsolete. |