Let sleep(1) handle fractions of a second (up to nanosecond).

This is a conservative change.  It does the same thing in weird
cases like the old one.  For example, 'sleep abcd' still sleeps
for zero seconds.  `sleep 10.a' and `sleep 10.05aa' do the best
and not abort (ie: 10.a == 10 seconds, 10.05a == 10.05 seconds).

1 files changed, 16 insertions, 8 deletions

diff --git a/bin/sleep/sleep.1 b/bin/sleep/sleep.1
index 237b57401463..1c5e6824123b 100644
--- a/bin/sleep/sleep.1
+++ b/bin/sleep/sleep.1
@@ -42,7 +42,7 @@
 .Nm sleep
 .Nd suspend execution for an interval of time
 .Sh SYNOPSIS
-.Nm sleep
+.Nm
 .Ar seconds
 .Sh DESCRIPTION
 The
@@ -50,17 +50,27 @@ The
 command
 suspends execution for a minimum of
 .Ar seconds .
-.Nm Sleep
-is used to schedule the execution of other commands (see
-.Sx EXAMPLES
-below).
 .Pp
 If the
 .Nm
 command receives a signal, it takes the standard action.
+.Sh IMPLEMENTATION NOTES
 The
 .Dv SIGALRM
 signal is not handled specially by this implementation.
+.Pp
+The
+.Nm
+command will accept and honor a non-integer number of specified seconds
+.Po
+with a
+.Ql \&.
+character as a decimal point
+.Pc .
+.Bf Sy
+This is a non-portable extension, and its use will nearly guarantee that
+a shell script will not execute properly on another system.
+.Ef
 .Sh DIAGNOSTICS
 The
 .Nm
@@ -110,9 +120,7 @@ when the file is found, then another portion processing
 is done courteously by sleeping for 70 seconds in between each
 awk job.
 .Sh SEE ALSO
-.Xr at 1 ,
-.Xr nanosleep 2 ,
-.Xr sleep 3
+.Xr nanosleep 2
 .Sh STANDARDS
 The
 .Nm