df

SYNOPSIS
       df [OPTION]... [FILE]...
（FILE需要使用绝对路径）
DESCRIPTION
       This  manual  page  documents the GNU version of df.  df displays the amount of disk space available on the file system containing each file
       name argument.  If no file name is given, the space available on all currently mounted file systems is shown.  Disk space  is  shown  in  1K
       blocks by default, unless the environment variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.

       If  an  argument is the absolute file name of a disk device node containing a mounted file system, df shows the space available on that file
       system rather than on the file system containing the device node (which is always the root file system).  This version of df cannot show the
       space  available  on  unmounted file systems, because on most kinds of systems doing so requires very nonportable intimate knowledge of file
       system structures.

OPTIONS
       Show information about the file system on which each FILE resides, or all file systems by default.

       Mandatory arguments to long options are mandatory for short options too.

（一）显示单位 （默认为K）

       -B, --block-size=SIZE
              scale sizes by SIZE before printing them.  E.g., '-BM' prints sizes in units of 1,048,576 bytes.  See SIZE format below.
       -k     like --block-size=1K （默认显示单位为K）

       -h, --human-readable
              print sizes in human readable format (e.g., 1K 234M 2G)

       --total
              produce a grand total

关于单位的简单说明：

       Display values are in units of the first available SIZE from --block-size, and the DF_BLOCK_SIZE, BLOCK_SIZE and BLOCKSIZE environment vari‐
       ables.  Otherwise, units default to 1024 bytes (or 512 if POSIXLY_CORRECT is set).

       SIZE is an integer and optional unit (example: 10M is 10*1024*1024).  Units are K, M, G, T, P, E, Z, Y (powers of 1024) or KB, MB, ... (pow‐
       ers of 1000).

（二）文件系统

       -t, --type=TYPE
              limit listing to file systems of type TYPE
       -x, --exclude-type=TYPE
              limit listing to file systems not of type TYPE

       -T, --print-type
              print file system type

针对不同的文件系统筛选（对于双系统或更多尤其是win与linux共存的电脑有好的作用）
 
（三）杂项

       --no-sync
              do not invoke sync before getting usage info (default)
       --sync invoke sync before getting usage info
是否进行同步

 

本人喜欢的组合：

#df -h -T