Meaning of df and df -lh

df -lh is to display local file system information in easy-to-read size units.
The function of the df command in linux is to check the disk space occupancy of the file system of the linux server.You can use this command to obtain information such as how much space is occupied by the hard disk and how much space is left.
1.Command format:
df [options] [files]
2.Command function:
Display the available space of the specified disk file.If no filename is specified, the free space for all currently mounted filesystems will be displayed.By default, disk space will be displayed in 1KB units, unless the environment variable POSIXLY_CORRECT is specified, in which case it will be displayed in 512-byte units.
3.Command parameters:
Required parameters:
-a List of all file systems
-h Display in a convenient way to read
-H is equal to "-h", but the calculation formula, 1K=1000, not 1K=1024
-i show inode info
-k block is 1024 bytes
-l only show local file system
-m block is 1048576 bytes
--no-sync ignore syncCommand
-P The output format is POSIX
–sync Before getting disk information, execute the sync command first
-T file system type
Optional parameters:
–block-size= specify block size
-t only display disk information for the selected filesystem
-x do not display disk information for the selected filesystem
–helpshow help info
--version show version info