题目

英语翻译
参考：
出现在一下环境中,关于linux的命令说明的
NAME
mkdir - make directories
SYNOPSIS
mkdir [OPTION] DIRECTORY...
DESCRIPTION
Create the DIRECTORY(ies),if they do not already exist.
Mandatory arguments to long options are mandatory for short options too.
-m,--mode=MODE
set permission mode (as in chmod),not rwxrwxrwx - umask
-p,--parents
no error if existing,make parent directories as needed
-v,--verbose
print a message for each created directory
-Z,--context=CONTEXT (SELinux) set security context to CONTEXT
--help display this help and exit
--version
output version information and exit

提问时间：2020-10-15

答案

对于长选项来说必须的参数,对于短选项也是必须的.
举例来说,如本例中的--mode=MODE与其短选项-m
使用--mode时必须加的权限参数,如mkdir --mode=755 DIRECTORY或mkdir --mode 755 DIRECTORY,这是长选项,对于短选项-m,其权限参数同样不可省略,如mkidr -m 755 DIRECTORY