If you want to know the list of files in a directory you are in, you can use the ls command,
Example:ls
bin boot cocalc dev etc ext
home lib lib32 lib64 libx32
media mnt opt proc root run
sbin secrets srv sys tmp usr
var
Now lets try ls -l where -l: long listing format,
Example:ls -l
total 32
drwxr-xr-x 1 root root 87188 Aug 18 09:54 bin
drwxr-xr-x 2 root root 4096 Apr 24 2018 boot
drwxr-xr-x 1 root root 4096 Aug 12 20:40 cocalc
drwxr-xr-x 5 root root 360 Aug 22 09:59 dev
drwxr-xr-x 1 root root 4896 Aug 18 10:47 etc
drwxr-xr-x 1 root root 232 Aug 18 11:17 ext
drwxr-xr-x 1 root root 4096 Aug 12 20:40 home
drwxr-xr-x 1 root root 17526 Aug 18 09:53 lib
drwxr-xr-x 1 root root 2422 May 27 12:25 lib32
drwxr-xr-x 1 root root 40 May 25 12:51 lib64
drwxr-xr-x 1 root root 2544 May 27 12:25 libx32
drwxr-xr-x 2 root root 4096 Jul 13 14:48 media
drwxr-xr-x 2 root root 4096 Jul 13 14:48 mnt
drwxr-xr-x 1 root root 64 Jul 30 12:41 opt
dr-xr-xr-x 2313 root root 0 Aug 22 09:59 proc
drwx------ 2 root root 4096 Jul 13 14:49 root
drwxr-xr-x 1 root root 4096 Aug 12 20:40 run
drwxr-xr-x 1 root root 8994 Aug 18 09:53 sbin
drwxr-xr-x 4 root root 4096 Aug 22 09:59 secrets
drwxr-xr-x 1 root root 0 Apr 23 11:06 srv
dr-xr-xr-x 13 root root 0 Aug 22 09:59 sys
drwxrwxrwt 5 root root 100 Aug 22 10:02 tmp
drwxr-xr-x 1 root root 122 May 28 17:35 usr
drwxr-xr-x 1 root root 108 May 27 12:21 var
/$
How to display file or directory size using ls in KB, MB or GB?
In order to display file or directory size KBs (Kilobytes), MB (megabytes) or GB (gigabytes) you can make use the ls -lh command.
Example:/$ ls -lh
total 32K
drwxr-xr-x 1 root root 86G Aug 18 09:54 bin
drwxr-xr-x 2 root root 4.0K Apr 24 2018 boot
drwxr-xr-x 1 root root 4.0K Aug 12 20:40 cocalc
drwxr-xr-x 5 root root 360 Aug 22 09:59 dev
drwxr-xr-x 1 root root 4.8M Aug 18 10:47 etc
drwxr-xr-x 1 root root 232 Aug 18 11:17 ext
drwxr-xr-x 1 root root 4.0K Aug 12 20:40 home
drwxr-xr-x 1 root root 18K Aug 18 09:53 lib
drwxr-xr-x 1 root root 2.4K May 27 12:25 lib32
drwxr-xr-x 1 root root 40 May 25 12:51 lib64
drwxr-xr-x 1 root root 2.5K May 27 12:25 libx32
drwxr-xr-x 2 root root 4.0K Jul 13 14:48 media
drwxr-xr-x 2 root root 4.0K Jul 13 14:48 mnt
drwxr-xr-x 1 root root 64 Jul 30 12:41 opt
dr-xr-xr-x 2230 root root 0 Aug 22 09:59 proc
drwx------ 2 root root 4.0K Jul 13 14:49 root
drwxr-xr-x 1 root root 4.0K Aug 12 20:40 run
drwxr-xr-x 1 root root 8.8K Aug 18 09:53 sbin
drwxr-xr-x 4 root root 4.0K Aug 22 09:59 secrets
drwxr-xr-x 1 root root 0 Apr 23 11:06 srv
dr-xr-xr-x 13 root root 0 Aug 22 09:59 sys
drwxrwxrwt 5 root root 100 Aug 22 10:04 tmp
drwxr-xr-x 1 root root 122 May 28 17:35 usr
drwxr-xr-x 1 root root 108 May 27 12:21 var
/$
Note that now the sizes are displayed with a number followed by K -> Kilobytes where every you do not see K the size are in bytes.
⛏️ This command will work on all flavors of Linux, Unix, macOS and Windows Bash Shell.
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