update manpage

free.1

@@ -1,21 +1,21 @@
-.Dd March 10, 2008
+.Dd December 30, 2023
 .Dt FREE 1
 .Os
 .Sh NAME
 .Nm free
 .Nd Display the amount of free and used memory in the system
 .Sh SYNOPSIS
 .Nm
-.Fl b
-.Op Fl s Ar delay
+
 .Nm
-.Fl k
-.Op Fl s Ar delay
+.Fl h
+
 .Nm
-.Fl m
-.Op Fl m Ar delay
+.Fl h
+.Op Fl s Ar delay
+
 .Nm
-.Fl Vh?
+.Fl v
 .Sh DESCRIPTION
 The
 .Nm
@@ -24,40 +24,21 @@ system, as well as the active, inactive, and wired page counts.
 .Pp
 The following options are available:
 .Bl -tag -width indent
-.It Fl b
-Display memory sizes in bytes.
-.It Fl k
-Display memory sizes in kilobytes (default if no options given).
-.It Fl m
-Display memory sizes in megabytes.
+.It Fl h
+Display memory sizes in human-friendly format
 .It Fl s Ar delay
 Sleep for
 .Ar delay
 seconds before display memory statistics again.  This option causes free to
 continuously poll the system until SIGINT is given.
-.It Fl V
+.It Fl v
 Display version information.
-.El
-.Pp
-The
-.Fl h
-and
-.Fl ?
-options display usage information.
 .Sh NOTES
 .Pp
 .Nm
-is modeled after the free utility on Linux systems (the one from the procps
-project).  This version aims to offer similar functionality, but due to
-design differences between Linux and Darwin, that is not always possible.
+is modeled after the free utility on Linux systems (the one from the procps project).  This version aims to offer similar functionality, but due to design differences between Linux and Darwin, that is not always possible.
 .Pp
-The columns that free displays may be a bit confusing.  The first one, total,
-display the total amount of memory for that area.  The used column displays
-the amount of total memory that is currently in use.  The free column displays
-the amount of total memory that is currently in use.  The active column displays
-the number of active pages in the used memory.  The inactive column shows the
-number of inactive pages in the used memory.  And the wired column displays
-the number of wired down pages in the used memory.
+The columns that free displays may be a bit confusing.  The first one, total, display the total amount of memory for that area.  The used column displays the amount of total memory that is currently in use.  The free column displays the amount of total memory that is currently in use.  The active column displays the number of active pages in the used memory.  The inactive column shows the number of inactive pages in the used memory.  And the wired column displays the number of wired down pages in the used memory.
 .Pp
 The Mem: row uses these formulas:
 .Dl total = used + free
@@ -68,10 +49,7 @@ The Mem: row uses these formulas:
 .Xr top 1
 .Sh BUGS
 .Pp
-Report bugs at http://code.google.com/p/darwin-free/
+Report bugs at https://github.com/zfdang/free-for-macOS
 .Sh AUTHORS
 .Pp
-Written by David Cantrell <david.l.cantrell@gmail.com>
-.Pp
-Contributions from Logan Johnson <logan.johnson@gmail.com> and
-Jim Bair <tseuhpsyde@gmail.com>
+Written by Zhengfa