[root@testserver linuxStudy]# pwd
/usr/local/linuxStudy

[root@testserver linuxStudy]# mkdir dir1
[root@testserver linuxStudy]# ls
dir1

[root@testserver linuxStudy]# mkdir dir2 dir3
[root@testserver linuxStudy]# ls
dir1  dir2  dir3

[root@testserver linuxStudy]# mkdir dir1
mkdir: cannot create directory `dir1': File exists

[root@testserver linuxStudy]# mkdir dir4/dir5                           #未加-p参数，上层目录不存在时，创建目录失败
mkdir: cannot create directory `dir4/dir5': No such file or directory
[root@testserver linuxStudy]# mkdir -p dir4/dir5                        #-p：上层目录不存在时，同步创建
[root@testserver linuxStudy]# ls -R                                     #-R：递归列出当前目录下所有的目录、文件
.:
dir1  dir2  dir3  dir4
./dir1:
./dir2:
./dir3:
./dir4:
dir5
./dir4/dir5:
[root@testserver linuxStudy]# 

[root@testserver linuxStudy]# mkdir -v dir6
mkdir: created directory `dir6'
[root@testserver linuxStudy]# mkdir -v dir7 dir8
mkdir: created directory `dir7'
mkdir: created directory `dir8'

[root@testserver linuxStudy]# mkdir -m o-rw dir10  #创建dir10目录，other用户去掉rw权限
[root@testserver linuxStudy]# ll
total 36
drwxr-xr-x 2 root root 4096 May  9 14:47 dir1
drwxrwx--x 2 root root 4096 May  9 15:08 dir10
drwxr-xr-x 2 root root 4096 May  9 14:47 dir2
drwxr-xr-x 2 root root 4096 May  9 14:47 dir3
drwxr-xr-x 3 root root 4096 May  9 14:52 dir4
drwxr-xr-x 2 root root 4096 May  9 15:02 dir6
drwxr-xr-x 2 root root 4096 May  9 15:02 dir7
drwxr-xr-x 2 root root 4096 May  9 15:02 dir8
drwxrwxrwx 2 root root 4096 May  9 15:07 dir9
[root@testserver linuxStudy]# mkdir -m 511 dir11  #创建dir11目录，设置user、group、other用户权限分别为5、1、1（读权限4，写权限2，执行权限1，用户具备多种权限时值相加）
[root@testserver linuxStudy]# ll
total 40
drwxr-xr-x 2 root root 4096 May  9 14:47 dir1
drwxrwx--x 2 root root 4096 May  9 15:08 dir10
dr-x--x--x 2 root root 4096 May  9 15:09 dir11
drwxr-xr-x 2 root root 4096 May  9 14:47 dir2
drwxr-xr-x 2 root root 4096 May  9 14:47 dir3
drwxr-xr-x 3 root root 4096 May  9 14:52 dir4
drwxr-xr-x 2 root root 4096 May  9 15:02 dir6
drwxr-xr-x 2 root root 4096 May  9 15:02 dir7
drwxr-xr-x 2 root root 4096 May  9 15:02 dir8
drwxrwxrwx 2 root root 4096 May  9 15:07 dir9

[root@testserver local]# man mkdir
MKDIR(1)                         User Commands                        MKDIR(1)
NAME
       mkdir - make directories   #创建目录
SYNOPSIS
       mkdir [OPTION]... DIRECTORY...
DESCRIPTION
       Create the DIRECTORY(ies), if they do not already exist. #目录已存在时，创建目录失败
       Mandatory arguments to long options are mandatory for short options too.
       -m, --mode=MODE
              set file mode (as in chmod), not a=rwx - umask #设置文件权限，而不是默认权限a=rwx
       -p, --parents
              no error if existing, make parent directories as needed  #父目录不存在时，创建所需的父目录
       -v, --verbose
              print a message for each created directory #对每一个创建的目录打印1条信息
       -Z, --context=CTX
              set the SELinux security context of each created directory to CTX
       --help display this help and exit
       --version
              output version information and exit
AUTHOR
       Written by David MacKenzie.
REPORTING BUGS
       Report mkdir bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report mkdir translation bugs to <http://translationproject.org/team/>
COPYRIGHT
       Copyright   ©   2010   Free   Software   Foundation,   Inc.   License  GPLv3+:  GNU  GPL  version  3  or  later
       <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permit-
       ted by law.
SEE ALSO
       mkdir(2)
       The  full  documentation for mkdir is maintained as a Texinfo manual.  If the info and mkdir programs are prop-
       erly installed at your site, the command
              info coreutils 'mkdir invocation'
       should give you access to the complete manual.
GNU coreutils 8.4                November 2013                        MKDIR(1)
(END)