Ls display file size display unit

When the file size is displayed in linux, "ls-l" is usually used to display the file size in bytes.
However, if the file is large, it is not particularly readable. In this case, you can use "ls-lh" to display the file size in a unit close to the file size, as follows:

[billing_dx@bmcs1 bin]$ ls -lhtotal 565M-rwxr-xr-x 1 billing_dx BILLING 1.1M Mar 10 18:56 AcctMgrService-rw-r--r-- 1 billing_dx BILLING  364 Mar 10 18:59 AcctMgrService.conf-rw------- 1 billing_dx BILLING  11G Mar 13 18:37 core.22836-rw-r--r-- 1 billing_dx BILLING  410 Mar 13 17:38 dll_info.conf-rwxr-xr-x 1 billing_dx BILLING   39 Mar 10 18:57 go

When the "-h" parameter is used, the displayed unit is "K", "M", or "G" based on the file size ". If you want to specify the display unit, you can use the "-- block-size" parameter, as shown below:

[billing_dx@bmcs1 bin]$ ls -ltotal 577724-rwxr-xr-x 1 billing_dx BILLING     1103862 Mar 10 18:56 AcctMgrService-rw-r--r-- 1 billing_dx BILLING         364 Mar 10 18:59 AcctMgrService.conf-rw------- 1 billing_dx BILLING 10947788800 Mar 13 18:37 core.22836-rw-r--r-- 1 billing_dx BILLING         410 Mar 13 17:38 dll_info.conf-rwxr-xr-x 1 billing_dx BILLING          39 Mar 10 18:57 go[billing_dx@bmcs1 bin]$ ls -l --block-size=k total 577724K-rwxr-xr-x 1 billing_dx BILLING     1078K Mar 10 18:56 AcctMgrService-rw-r--r-- 1 billing_dx BILLING        1K Mar 10 18:59 AcctMgrService.conf-rw------- 1 billing_dx BILLING 10691200K Mar 13 18:37 core.22836-rw-r--r-- 1 billing_dx BILLING        1K Mar 13 17:38 dll_info.conf-rwxr-xr-x 1 billing_dx BILLING        1K Mar 10 18:57 go[billing_dx@bmcs1 bin]$ ls -l --block-size=mtotal 565M-rwxr-xr-x 1 billing_dx BILLING     2M Mar 10 18:56 AcctMgrService-rw-r--r-- 1 billing_dx BILLING     1M Mar 10 18:59 AcctMgrService.conf-rw------- 1 billing_dx BILLING 10441M Mar 13 18:37 core.22836-rw-r--r-- 1 billing_dx BILLING     1M Mar 13 17:38 dll_info.conf-rwxr-xr-x 1 billing_dx BILLING     1M Mar 10 18:57 go[billing_dx@bmcs1 bin]$ ls -l --block-size=gtotal 1G-rwxr-xr-x 1 billing_dx BILLING  1G Mar 10 18:56 AcctMgrService-rw-r--r-- 1 billing_dx BILLING  1G Mar 10 18:59 AcctMgrService.conf-rw------- 1 billing_dx BILLING 11G Mar 13 18:37 core.22836-rw-r--r-- 1 billing_dx BILLING  1G Mar 13 17:38 dll_info.conf-rwxr-xr-x 1 billing_dx BILLING  1G Mar 10 18:57 go

After comparison, we can see that when different units are used for display, we use the one-in-one method. Therefore, for a 1 K object, G is used for display, it is displayed as "1 GB ". Therefore, we still use "-h" to display it, which is more in line with people's habits.
The following is the description of ls:

billing_dx@bmcs1 bin]$ man lsLS(1)                            User Commands                           LS(1)NAME   ls - list directory contentsSYNOPSIS   ls [OPTION]... [FILE]...DESCRIPTION   List  information  about the FILEs (the current directory by default).  Sort entries alphabetically if   none of -cftuvSUX nor --sort.   Mandatory arguments to long options are mandatory for short options too.   -h, --human-readable          with -l, print sizes in human readable format (e.g., 1K 234M 2G)   -k     like --block-size=1K   -l     use a long listing format   --block-size=SIZE          use SIZE-byte blocks.  See SIZE format below   SIZE  may  be  (or  may  be  an  integer optionally followed by) one of following: KB 1000, K 1024, MB   1000*1000, M 1024*1024, and so on for G, T, P, E, Z, Y.

Additional reading: http://hi.baidu.com/shiliangshuai/item/2310fac2ce7aa3bb0c0a7b3f