`mkdir -p /x/y/z ; cd $_`

`mkdir -p dirName ; cd $_`

`mkdir -p folderName;cd $_`

创建并进入文件夹的通常方法是先创建文件夹再进入文件夹
这样的话,文件夹路径名要写两遍
例如

sudo mkdir -p ~/hello/world/ni/hao
cd ~/hello/world/ni/hao

发现一个好东东 $_ $下划线

只写一遍目录名

sudo mkdir -p ~/hello/world/ni/hao ; cd $_

也可以

sudo mkdir -p ~/hello/world/ni/hao && cd $_

$_应该是表示最后一个参数, 下面是一个测试

Ubuntu22.04桌面版的 mkdir 命令笔记

mkdir 用于创建文件夹

mkdir -p 自动创建父文件夹,父文件夹存不存在都没关系, 等效 mkdir --parents

mkdir --help

用法：mkdir [选项]… 目录…
若指定<目录>不存在则创建目录。

必选参数对长短选项同时适用。
-m, --mode=模式设置权限模式（类似chmod），而不是 a=rwx 减 umask
-p, --parents 需要时创建目标目录的上层目录，但即使这些目录已存在
也不当作错误处理
-v, --verbose 每次创建新目录都显示信息
-Z 设置每个创建的目录的 SELinux 安全上下文为默认类型
–context[=CTX] 类似 -Z，或如果指定了 CTX，则将 SELinux 或 SMACK 安全
上下文设置为 CTX 对应的值
–help 显示此帮助信息并退出
–version 显示版本信息并退出

用法：mkdir [选项]... 目录...
若指定<目录>不存在则创建目录。必选参数对长短选项同时适用。-m, --mode=模式   设置权限模式（类似chmod），而不是 a=rwx 减 umask-p, --parents     需要时创建目标目录的上层目录，但即使这些目录已存在也不当作错误处理-v, --verbose     每次创建新目录都显示信息-Z                   设置每个创建的目录的 SELinux 安全上下文为默认类型--context[=CTX]  类似 -Z，或如果指定了 CTX，则将 SELinux 或 SMACK 安全上下文设置为 CTX 对应的值--help       显示此帮助信息并退出--version     显示版本信息并退出

man mkdir

MKDIR(1)                                                     User Commands                                                    MKDIR(1)NAMEmkdir - make directoriesSYNOPSISmkdir [OPTION]... DIRECTORY...DESCRIPTIONCreate the DIRECTORY(ies), if they do not already exist.Mandatory arguments to long options are mandatory for short options too.-m, --mode=MODEset file mode (as in chmod), not a=rwx - umask-p, --parentsno error if existing, make parent directories as needed-v, --verboseprint a message for each created directory-Z     set SELinux security context of each created directory to the default type--context[=CTX]like -Z, or if CTX is specified then set the SELinux or SMACK security context to CTX--help display this help and exit--versionoutput version information and exitAUTHORWritten by David MacKenzie.REPORTING BUGSGNU coreutils online help: <https://www.gnu.org/software/coreutils/>Report any translation bugs to <https://translationproject.org/team/>COPYRIGHTCopyright  ©  2020  Free  Software  Foundation,  Inc.   License  GPLv3+:  GNU  GPL  version  3  or  later  <https://gnu.org/li‐censes/gpl.html>.This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.SEE ALSOmkdir(2)Full documentation <https://www.gnu.org/software/coreutils/mkdir>or available locally via: info '(coreutils) mkdir invocation'GNU coreutils 8.32                                           February 2022                                                    MKDIR(1)

MKDIR(1) User Commands MKDIR(1)

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=MODEset file mode (as in chmod), not a=rwx - umask-p, --parentsno error if existing, make parent directories as needed-v, --verboseprint a message for each created directory-Z     set SELinux security context of each created directory to the default type--context[=CTX]like -Z, or if CTX is specified then set the SELinux or SMACK security context to CTX--help display this help and exit--versionoutput version information and exit

AUTHOR
Written by David MacKenzie.

REPORTING BUGS
GNU coreutils online help: https://www.gnu.org/software/coreutils/
Report any translation bugs to https://translationproject.org/team/

COPYRIGHT
Copyright © 2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <https://gnu.org/li‐
censes/gpl.html>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

info mkdir

File: coreutils.info,  Node: mkdir invocation,  Next: mkfifo invocation,  Prev: ln invocation,  Up: Special file types12.3 ‘mkdir’: Make directories
==============================‘mkdir’ creates directories with the specified names.  Synopsis:mkdir [OPTION]... NAME...‘mkdir’ creates each directory NAME in the order given.  It reports
an error if NAME already exists, unless the ‘-p’ option is given and
NAME is a directory.The program accepts the following options.  Also see *note Common
options::.‘-m MODE’
‘--mode=MODE’Set the file permission bits of created directories to MODE, whichuses the same syntax as in ‘chmod’ and uses ‘a=rwx’ (read, writeand execute allowed for everyone) for the point of the departure.*Note File permissions::.Normally the directory has the desired file mode bits at the momentit is created.  As a GNU extension, MODE may also mention specialmode bits, but in this case there may be a temporary window duringwhich the directory exists but its special mode bits are incorrect.*Note Directory Setuid and Setgid::, for how the set-user-ID andset-group-ID bits of directories are inherited unless overridden inthis way.‘-p’
‘--parents’Make any missing parent directories for each argument, settingtheir file permission bits to the umask modified by ‘u+wx’.  Ignoreexisting parent directories, and do not change their filepermission bits.To set the file permission bits of any newly-created parentdirectories to a value that includes ‘u+wx’, you can set the umaskbefore invoking ‘mkdir’.  For example, if the shell command ‘(umasku=rwx,go=rx; mkdir -p P/Q)’ creates the parent ‘P’ it sets theparent’s permission bits to ‘u=rwx,go=rx’.  To set a parent’sspecial mode bits as well, you can invoke ‘chmod’ after ‘mkdir’.*Note Directory Setuid and Setgid::, for how the set-user-ID andset-group-ID bits of newly-created parent directories areinherited.‘-v’
‘--verbose’Print a message for each created directory.  This is most usefulwith ‘--parents’.‘-Z’
‘--context[=CONTEXT]’Without a specified CONTEXT, adjust the SELinux security contextaccording to the system default type for destination files,similarly to the ‘restorecon’ command.  The long form of thisoption with a specific context specified, will set the context fornewly created files only.  With a specified context, if bothSELinux and SMACK are disabled, a warning is issued.An exit status of zero indicates success, and a nonzero value
indicates failure.

File: coreutils.info, Node: mkdir invocation, Next: mkfifo invocation, Prev: ln invocation, Up: Special file types

12.3 ‘mkdir’: Make directories

‘mkdir’ creates directories with the specified names. Synopsis:

 mkdir [OPTION]... NAME...

‘mkdir’ creates each directory NAME in the order given. It reports
an error if NAME already exists, unless the ‘-p’ option is given and
NAME is a directory.

The program accepts the following options. Also see *note Common
options::.

‘-m MODE’
‘–mode=MODE’
Set the file permission bits of created directories to MODE, which
uses the same syntax as in ‘chmod’ and uses ‘a=rwx’ (read, write
and execute allowed for everyone) for the point of the departure.
*Note File permissions::.

 Normally the directory has the desired file mode bits at the momentit is created.  As a GNU extension, MODE may also mention specialmode bits, but in this case there may be a temporary window duringwhich the directory exists but its special mode bits are incorrect.*Note Directory Setuid and Setgid::, for how the set-user-ID andset-group-ID bits of directories are inherited unless overridden inthis way.

‘-p’
‘–parents’
Make any missing parent directories for each argument, setting
their file permission bits to the umask modified by ‘u+wx’. Ignore
existing parent directories, and do not change their file
permission bits.

 To set the file permission bits of any newly-created parentdirectories to a value that includes ‘u+wx’, you can set the umaskbefore invoking ‘mkdir’.  For example, if the shell command ‘(umasku=rwx,go=rx; mkdir -p P/Q)’ creates the parent ‘P’ it sets theparent’s permission bits to ‘u=rwx,go=rx’.  To set a parent’sspecial mode bits as well, you can invoke ‘chmod’ after ‘mkdir’.*Note Directory Setuid and Setgid::, for how the set-user-ID andset-group-ID bits of newly-created parent directories areinherited.

‘-v’
‘–verbose’
Print a message for each created directory. This is most useful
with ‘–parents’.

‘-Z’
‘–context[=CONTEXT]’
Without a specified CONTEXT, adjust the SELinux security context
according to the system default type for destination files,
similarly to the ‘restorecon’ command. The long form of this
option with a specific context specified, will set the context for
newly created files only. With a specified context, if both
SELinux and SMACK are disabled, a warning is issued.

An exit status of zero indicates success, and a nonzero value
indicates failure.

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