diff options
| author | Mateusz Piotrowski <0mp@FreeBSD.org> | 2024-04-23 14:12:45 +0000 |
|---|---|---|
| committer | Mateusz Piotrowski <0mp@FreeBSD.org> | 2024-04-28 18:28:43 +0000 |
| commit | bb27b83033d0a9a6425ceb508ad51cfb0cf266ea (patch) | |
| tree | 19311265c7ae074aee4631e2c74ba07cc5c4d017 /bin/sync | |
| parent | 43fae14940a5db63e30acd48c2d1a2fcc35f6aaf (diff) | |
Diffstat (limited to 'bin/sync')
| -rw-r--r-- | bin/sync/sync.8 | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/bin/sync/sync.8 b/bin/sync/sync.8 index 732d813880e2..222e9edf59f9 100644 --- a/bin/sync/sync.8 +++ b/bin/sync/sync.8 @@ -28,7 +28,7 @@ .\" .\" @(#)sync.8 8.1 (Berkeley) 5/31/93 .\" -.Dd May 31, 1993 +.Dd April 25, 2024 .Dt SYNC 8 .Os .Sh NAME @@ -71,3 +71,31 @@ 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. |