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df(1): Add EXAMPLES section to man page

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* Add EXAMPLES section with four simple examples.
* Simplify -H flag description. This makes easy to see the difference between
  this flag and -h
* While here, fix .Tn deprecated macro.

Approved by:	manpages (bcr@)
Differential Revision:	https://reviews.freebsd.org/D26662
This commit is contained in:
Fernando Apesteguía 2020-10-05 13:39:37 +00:00
parent 270a486931
commit ad3d2e7e4a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=366445
1 changed files with 51 additions and 11 deletions
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62
bin/df/df.1
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@ -29,7 +29,7 @@
.\" @(#)df.1 8.3 (Berkeley) 5/8/95
.\" $FreeBSD$
.\"
.Dd August 8, 2017
.Dd October 5, 2020
.Dt DF 1
.Os
.Sh NAME
@ -98,12 +98,9 @@ Use unit suffixes: Byte, Kibibyte, Mebibyte, Gibibyte, Tebibyte and
Pebibyte (based on powers of 1024) in order to reduce the number of
digits to four or fewer.
.It Fl H , Fl Fl si
.Dq Human-readable
output.
Use unit suffixes: Byte, Kilobyte, Megabyte,
Gigabyte, Terabyte and Petabyte (based on powers of 1000) in order to
reduce the number of
digits to four or fewer.
Same as
.Fl h
but based on powers of 1000.
.It Fl i
Include statistics on the number of free and used inodes.
In conjunction with the
@ -159,10 +156,7 @@ command:
df -t nonfs,nullfs
.Ed
.Pp
lists all file systems except those of type
.Tn NFS
and
.Tn NULLFS .
lists all file systems except those of type NFS and NULLFS.
The
.Xr lsvfs 1
command can be used to find out the types of file systems
@ -193,6 +187,52 @@ which allows units of bytes or numbers scaled with the letters
The allowed range is 512 bytes to 1 GB.
If the value is outside, it will be set to the appropriate limit.
.El
.Sh EXAMPLES
Show human readable free disk space for all mount points including file system
type:
.Bd -literal -offset indent
$ df -ahT
Filesystem Type Size Used Avail Capacity Mounted on
/dev/ada1p2 ufs 213G 152G 44G 78% /
devfs devfs 1.0K 1.0K 0B 100% /dev
/dev/ada0p1 ufs 1.8T 168G 1.5T 10% /data
linsysfs linsysfs 4.0K 4.0K 0B 100% /compat/linux/sys
/dev/da0 msdosfs 7.6G 424M 7.2G 5% /mnt/usb
.Ed
.Pp
Show previously collected data including inode statistics except for devfs or
linsysfs file systems.
Note that the
.Dq no
prefix affects all the file systems in the list and the
.Fl t
option can be specified only once:
.Bd -literal -offset indent
$ df -i -n -t nodevfs,linsysfs
Filesystem 1K-blocks Used Avail Capacity iused ifree %iused
Mounted on
/dev/ada1p2 223235736 159618992 45757888 78% 1657590 27234568 6% /
/dev/ada0p1 1892163184 176319420 1564470712 10% 1319710 243300576 1%
/data
/dev/da0 7989888 433664 7556224 5% 0 0 100%
/mnt/usb
.Ed
.Pp
Show human readable information for the file system containing the file
.Pa /etc/rc.conf
:
.Bd -literal -offset indent
$ df -h /etc/rc.conf
Filesystem Size Used Avail Capacity Mounted on
/dev/ada1p2 213G 152G 44G 78% /
.Ed
.Pp
Same as above but specifying some file system:
.Bd -literal -offset indent
$ df -h /dev/ada1p2
Filesystem Size Used Avail Capacity Mounted on
/dev/ada1p2 213G 152G 44G 78% /
.Ed
.Sh SEE ALSO
.Xr lsvfs 1 ,
.Xr quota 1 ,