简单,但容易被忽略的事实(CMD/CD)

本文详细介绍了Windows命令行工具CMD中的常用命令及其用法,包括目录跳转(cd)、以树形格式罗列文件(tree)及内容重定向符号(>和>>)等。同时,还深入探讨了for语句的不同用法。

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目录跳转:cd
  当我们需要处理不同路径下的文件的时候,很可能需要切换目录,这个时候,可以考虑使用目录跳转命令cd

  例如,我们打开命令行窗口的时候,一般是这样操作的:在桌面左下角找到“开始”菜单,打开“运行”,输入“cmd”,回车。这个时候,命令行窗口默认的当前目录位于当前用户所在的路径下,比如:C:/Documents and Settings/JM,如下图所示。



 
默认目录
2008-11-12 21:19
  一般而言,这个目录下并没有我们想要处理的文件,我们很可能需要跳转到其他目录,比如说:C盘根目录,这个时候,我们就需要使用cd来实现目录的跳转了:cd c:/。


跳转到C盘
2008-11-12 21:19
  cd的全称是Change Directory,直译为改变文件夹,也就是跳转目录、切换路径的意思。它后面可以接驱动器符号、完整路径和相对路径。从它的全称可以得知,它不能操控文件,而只能作用于驱动器或文件夹。例如,我们使用 cd c:/boot.ini 这个命令来跳转(boot.ini是文件而非文件夹),就会出现“目录名无效”的错误,如下图所示。

不能跳转到文件
2008-11-12 21:19
  如果要跳转到当前目录的根目录下的话,可以使用一条简单的命令:cd/。如下图所示。


跳转到根目录下
2008-11-12 21:19
  继续跳转,cd c:/windows/temp,跳转到临时目录下。

  此时,如果想回到上一层目录windows,可以使用这条命令:cd..。如下图所示。


 
跳转到上一层
2008-11-12 21:19
  想想看,如果执行 cd. 会发生什么情况?

  结果,目录没有发生跳转,原地不动。如下图所示。利用这个原理,可以用 cd.>test.txt 来构造0字节的文本文件。详细情况,请参考这篇文章:本人常用的批处理实用技巧 之第2点。


 
跳转到当前目录
2008-11-12 21:19

  原来,cmd中,.、..和/表示相对路径,.是当前目录,..是上一层目录,而/表示根目录。

  来看一个比较诡异的现象:


何时使用强制跳转参数?



2008-11-12 21:19
  从当前目录下跳转到不同分区路径d:/的时候,cd d:/没有成功,当前目录没有发生改变;当添加了一个参数 /d 之后,命令成功地执行了。原来,要跳转到不同分区的时候,需要添加强制跳转参数 /d 。但是,如果进入的是当前目录的子目录,则可以不使用 /d 参数。 这一点是很容易被大家忽略的,希望能引起足够的重视。

  再来看一个更加诡异的现象:

 
驱动器冒号后添加反斜杠与否的差别
2008-11-12 21:19
  原来,当输入的是当前驱动器号+冒号的时候,将显示当前目录的完整路径;当输入的是当前驱动器号+冒号+反斜杠的时候,将跳转到当前路径的根目录下。

  
CD 的另一个非常有价值的用途是:显示当前的完整路径,一般用通过 %cd% 加以引用。如下图所示。此时,CD 作 Current Directory 解释,即“当前文件夹”。


显示当前路径
2008-11-12 21:26
  高级话题:看看下面这幅图反映了什么问题?



以树形格式罗列文件

tree ,在英语中的基本含义是“树”,在cmd中,tree命令的功能是以树形格式罗列文件。

  当你向别人展示你自己所做光盘的内容的时候,或者是罗列你硬盘上某个目录下的资料的时候,tree命令显得相当方便,并且能让你展示的内容层次分明,井井有条。啥也不说了,上图,顺便温习一下cd命令


tree
命令演示
2008-11-12 22:12

  当然,你可能并不满足于只给别人抓张图,你可能还想把这些信息导入到文件中去,加工一番再发出去,那么,请使用这条命令:tree>list.txt,这样,所有的信息都保存到list.txt文件中去了。

  更多的命令,请在cmd窗口中用 tree /? 查询(其实就两个参数)。

  很可能只是一条简单的命令,只是一眨眼的工夫,就解决了你的大问题,这就是cmd的简洁,这就是cmd的力量!


内容重定向符号:>和>>
  当我们在cmd窗口中查询某条命令的帮助信息的时候,帮助信息是显示在命令行窗口中的,命令行窗口关闭后,这些帮助信息就看不到了,如果下次还想看,又得在命令行窗口中输入查询命令,比较繁琐。

  有没有办法把显示在命令行窗口中的帮助信息保存下来呢?

  答案是肯定的,并且有不止一种答案。

  稍微繁琐一点的办法就是复制命令行窗口中的信息,然后粘贴到文本中保存起来。这个操作比较繁琐的:在命令行窗口点击右键,然后选择“标记”,用鼠标拉出复制范围,然后敲回车,最后,粘贴到文本中去。

  高效的办法就是:使用重定向符号,把原本输出到cmd窗口中的信息重定向到文本文件中去。

  重定向符号有两个:>和>>。它们的作用都是改变各种提示信息的输出方向,把提示信息输出到指定的地方去——各种提示信息默认是输出到屏幕上去的。例如:tree /?>help.txt,这条命令语句就把 tree 命令的帮助信息重定向到了help.txt文件中,help>nul 就把 help 命令的提示信息重定向到了空设备中去(nul表示空设备)。

  
想看看cmd中都有哪些基本命令吗?在cmd窗口中输入 help 就可以看到了;如果想把这些基本命令信息保存下来,请使用 help>d:/list.txt ,然后,到D盘根目录下找到list.txt文件打开即可。

  >和>>虽然都起到重定向提示信息的作用,但是,它们的作用稍有差别。单个的>表示以覆盖方式重定向提示信息,也就是说如果目的地原来有内容,将把原来的内容清除掉,用新内容填充;>>表示以追加的方式重定向提示信息,也就是说,如果目的地原来有内容,原有的内容将保持不变,在原有内容之后追加新内容。例如:假设d:/test.txt中的内容是:I Love batch。那么,在cmd窗口中,分别使用如下两条语句:echo me,too>d:/test.txt和echo me,too>>d:/test.txt,将会发现,使用第一条语句之后,test.txt中只有一行内容:me,too,而使用第二条语句之后,test.txt中将有两行内容,分别是I Love batch和me,too。



for 语句从入门到精通
  批处理是一门简单的脚本语言,虽然不能独当一面,但是,若作为工作中的辅助工具,绝对会让大家有随用随写、称心如意的畅快感。

  和其他语言相比,批处理语言有其先天性的优势:

  1、系统自带,无需另行安装;
  2、命令少,语句简洁,上手非常快;
  3、编写出来的脚本小巧玲珑,随写随用;

  但是,因为它以命令行方式工作,操作多有不便,在图形界面大行其道的windows世界里,多多少少会让大众望而却步;就算是对命令行有好感的新手,面对微软有如天书的帮助文件,很多人也会败下阵来,因此,论坛里很多会员也发出了编写系统的批处理教程的呼声。

  编写系统的批处理新手教程,一直是论坛管理层讨论的热点问题,但是,各位管理人员大多都有工作在身,而系统的教程涉及的面是如此之广,面对如此浩大的工程,仅凭一两个人的力量,是难以做好的,因此,本人退而求其次,此次发布的教程,以专题的形式编写,日后人手渐多之后,再考虑组织人力编写全面的教程。

  之所以选择最难的for,一是觉得for最为强大,是大多数人最希望掌握的;二是若写其他命令教程,如果没有for的基础,展开来讲解会无从下手;三是for也是批处理中最复杂最难掌握的语句,把它攻克了,批处理的学习将会一片坦途。

  这次的for语句系列教程,打算按照for语句的5种句式逐一展开,在讲解 for /f 的时候,会穿插讲解批处理中一个最为关键、也是新手最容易犯错的概念:变量延迟,大纲如下:
引用:

一 前言
二 for语句的基本用法
三 for /f (含变量延迟)
四 for /r
五 for /d
六 for /l
(base) C:\Users\60925>python --v unknown option --v usage: python [option] ... [-c cmd | -m mod | file | -] [arg] ... Try `python -h' for more information. (base) C:\Users\60925>python --version Python 3.7.1 (base) C:\Users\60925> (base) C:\Users\60925>conda install conda=4.8 Solving environment: failed CondaValueError: Malformed version string '~': invalid character(s). (base) C:\Users\60925>conda config --show-sources ==> C:\Users\60925\.condarc <== show_channel_urls: True (base) C:\Users\60925>conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main (base) C:\Users\60925>conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free (base) C:\Users\60925>conda config --set show_channel_urls true (base) C:\Users\60925>conda config --show add_anaconda_token: True add_pip_as_python_dependency: True aggressive_update_packages: - ca-certificates - certifi - openssl allow_non_channel_urls: False allow_softlinks: False always_copy: False always_softlink: False always_yes: None anaconda_upload: None auto_update_conda: True changeps1: True channel_alias: https://conda.anaconda.org channel_priority: True channels: - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free - https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main - defaults client_ssl_cert: None client_ssl_cert_key: None clobber: False create_default_packages: [] custom_channels: pkgs/main: https://repo.anaconda.com pkgs/free: https://repo.anaconda.com pkgs/r: https://repo.anaconda.com pkgs/pro: https://repo.anaconda.com pkgs/msys2: https://repo.anaconda.com custom_multichannels: defaults: ["https://repo.anaconda.com/pkgs/main", "https://repo.anaconda.com/pkgs/free", "https://repo.anaconda.com/pkgs/r", "https://repo.anaconda.com/pkgs/pro", "https://repo.anaconda.com/pkgs/msys2"] local: [] default_channels: - https://repo.anaconda.com/pkgs/main - https://repo.anaconda.com/pkgs/free - https://repo.anaconda.com/pkgs/r - https://repo.anaconda.com/pkgs/pro - https://repo.anaconda.com/pkgs/msys2 disallowed_packages: [] download_only: False envs_dirs: - D:\ruanjian\anaconda3\envs - C:\Users\60925\AppData\Local\conda\conda\envs - C:\Users\60925\.conda\envs extra_safety_checks: False force: False json: False local_repodata_ttl: 1 max_shlvl: 2 migrated_channel_aliases: [] no_dependencies: False non_admin_enabled: True notify_outdated_conda: True offline: False override_channels_enabled: True path_conflict: clobber pinned_packages: [] pkgs_dirs: - D:\ruanjian\anaconda3\pkgs - C:\Users\60925\AppData\Local\conda\conda\pkgs proxy_servers: {} quiet: False remote_connect_timeout_secs: 9.15 remote_max_retries: 3 remote_read_timeout_secs: 60.0 report_errors: None rollback_enabled: True safety_checks: warn shortcuts: True show_channel_urls: True ssl_verify: True track_features: [] use_index_cache: False use_pip: True verbosity: 0 whitelist_channels: [] (base) C:\Users\60925>conda config --remove-key channels CondaKeyError: 'channels': key 'channels' is not in the config file (base) C:\Users\60925>conda config --show channels channels: - defaults (base) C:\Users\60925>conda config --add channels http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/ (base) C:\Users\60925>conda config --add channels http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/ (base) C:\Users\60925>conda config --add channels http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/ (base) C:\Users\60925>conda config --show channels channels: - http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/ - http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/ - http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/ - defaults (base) C:\Users\60925>conda config --get channels --add channels 'defaults' # lowest priority --add channels 'http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/' --add channels 'http://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main/' --add channels 'http://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge/' # highest priority (base) C:\Users\60925>conda install conda=23.10.0 Solving environment: failed CondaValueError: Malformed version string '~': invalid character(s). (base) C:\Users\60925>conda install conda=4.8 Solving environment: failed CondaValueError: Malformed version string '~': invalid character(s). (base) C:\Users\60925>conda --version conda 4.5.12 (base) C:\Users\60925>conda update anaconda Solving environment: failed CondaValueError: Malformed version string '~': invalid character(s). (base) C:\Users\60925>conda update --all Solving environment: failed CondaValueError: Malformed version string '~': invalid character(s). (base) C:\Users\60925>conda update -n base -c defaults conda Solving environment: failed InvalidVersionSpecError: Invalid version spec: =2.7 (base) C:\Users\60925>conda clean --all Cache location: D:\ruanjian\anaconda3\pkgs Will remove the following tarballs: D:\ruanjian\anaconda3\pkgs -------------------------- alabaster-0.7.12-py37_0.tar.bz2 17 KB anaconda-2018.12-py37_0.tar.bz2 11 KB anaconda-client-1.7.2-py37_0.tar.bz2 199 KB anaconda-navigator-1.9.6-py37_0.tar.bz2 4.7 MB anaconda-project-0.8.2-py37_0.tar.bz2 493 KB asn1crypto-0.24.0-py37_0.tar.bz2 154 KB astroid-2.1.0-py37_0.tar.bz2 270 KB astropy-3.1-py37he774522_0.tar.bz2 6.9 MB atomicwrites-1.2.1-py37_0.tar.bz2 11 KB attrs-18.2.0-py37h28b3542_0.tar.bz2 51 KB babel-2.6.0-py37_0.tar.bz2 5.7 MB backcall-0.1.0-py37_0.tar.bz2 19 KB backports-1.0-py37_1.tar.bz2 3 KB backports.os-0.1.1-py37_0.tar.bz2 15 KB backports.shutil_get_terminal_size-1.0.0-py37_2.tar.bz2 8 KB beautifulsoup4-4.6.3-py37_0.tar.bz2 141 KB bitarray-0.8.3-py37hfa6e2cd_0.tar.bz2 56 KB bkcharts-0.2-py37_0.tar.bz2 127 KB blas-1.0-mkl.tar.bz2 6 KB blaze-0.11.3-py37_0.tar.bz2 624 KB bleach-3.0.2-py37_0.tar.bz2 218 KB blosc-1.14.4-he51fdeb_0.tar.bz2 651 KB bokeh-1.0.2-py37_0.tar.bz2 5.3 MB boto-2.49.0-py37_0.tar.bz2 1.6 MB bottleneck-1.2.1-py37h452e1ab_1.tar.bz2 112 KB bzip2-1.0.6-hfa6e2cd_5.tar.bz2 145 KB ca-certificates-2018.03.07-0.tar.bz2 155 KB certifi-2018.11.29-py37_0.tar.bz2 146 KB cffi-1.11.5-py37h74b6da3_1.tar.bz2 213 KB chardet-3.0.4-py37_1.tar.bz2 184 KB click-7.0-py37_0.tar.bz2 118 KB cloudpickle-0.6.1-py37_0.tar.bz2 27 KB clyent-1.2.2-py37_1.tar.bz2 18 KB colorama-0.4.1-py37_0.tar.bz2 24 KB comtypes-1.1.7-py37_0.tar.bz2 233 KB conda-4.5.12-py37_0.tar.bz2 1.1 MB conda-build-3.17.6-py37_0.tar.bz2 532 KB conda-env-2.6.0-1.tar.bz2 3 KB conda-verify-3.1.1-py37_0.tar.bz2 73 KB console_shortcut-0.1.1-3.tar.bz2 59 KB contextlib2-0.5.5-py37_0.tar.bz2 15 KB cryptography-2.4.2-py37h7a1dbc1_0.tar.bz2 550 KB 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pylint-2.2.2-py37_0.tar.bz2 Removed pyodbc-4.0.25-py37ha925a31_0.tar.bz2 Removed pyopenssl-18.0.0-py37_0.tar.bz2 Removed pyparsing-2.3.0-py37_0.tar.bz2 Removed pyqt-5.9.2-py37h6538335_2.tar.bz2 Removed pysocks-1.6.8-py37_0.tar.bz2 Removed pytables-3.4.4-py37he6f6034_0.tar.bz2 Removed pytest-4.0.2-py37_0.tar.bz2 Removed pytest-arraydiff-0.3-py37h39e3cac_0.tar.bz2 Removed pytest-astropy-0.5.0-py37_0.tar.bz2 Removed pytest-doctestplus-0.2.0-py37_0.tar.bz2 Removed pytest-openfiles-0.3.1-py37_0.tar.bz2 Removed pytest-remotedata-0.3.1-py37_0.tar.bz2 Removed python-3.7.1-h8c8aaf0_6.tar.bz2 Removed python-dateutil-2.7.5-py37_0.tar.bz2 Removed python-libarchive-c-2.8-py37_6.tar.bz2 Removed pytz-2018.7-py37_0.tar.bz2 Removed pywavelets-1.0.1-py37h8c2d366_0.tar.bz2 Removed pywin32-223-py37hfa6e2cd_1.tar.bz2 Removed pywinpty-0.5.5-py37_1000.tar.bz2 Removed pyyaml-3.13-py37hfa6e2cd_0.tar.bz2 Removed pyzmq-17.1.2-py37hfa6e2cd_0.tar.bz2 Removed qt-5.9.7-vc14h73c81de_0.tar.bz2 Removed qtawesome-0.5.3-py37_0.tar.bz2 Removed qtconsole-4.4.3-py37_0.tar.bz2 Removed qtpy-1.5.2-py37_0.tar.bz2 Removed requests-2.21.0-py37_0.tar.bz2 Removed rope-0.11.0-py37_0.tar.bz2 Removed ruamel_yaml-0.15.46-py37hfa6e2cd_0.tar.bz2 Removed scikit-image-0.14.1-py37ha925a31_0.tar.bz2 Removed scikit-learn-0.20.1-py37h343c172_0.tar.bz2 Removed scipy-1.1.0-py37h29ff71c_2.tar.bz2 Removed seaborn-0.9.0-py37_0.tar.bz2 Removed send2trash-1.5.0-py37_0.tar.bz2 Removed setuptools-40.6.3-py37_0.tar.bz2 Removed simplegeneric-0.8.1-py37_2.tar.bz2 Removed singledispatch-3.4.0.3-py37_0.tar.bz2 Removed sip-4.19.8-py37h6538335_0.tar.bz2 Removed six-1.12.0-py37_0.tar.bz2 Removed snappy-1.1.7-h777316e_3.tar.bz2 Removed snowballstemmer-1.2.1-py37_0.tar.bz2 Removed sortedcollections-1.0.1-py37_0.tar.bz2 Removed sortedcontainers-2.1.0-py37_0.tar.bz2 Removed sphinx-1.8.2-py37_0.tar.bz2 Removed sphinxcontrib-1.0-py37_1.tar.bz2 Removed sphinxcontrib-websupport-1.1.0-py37_1.tar.bz2 Removed spyder-3.3.2-py37_0.tar.bz2 Removed spyder-kernels-0.3.0-py37_0.tar.bz2 Removed sqlalchemy-1.2.15-py37he774522_0.tar.bz2 Removed sqlite-3.26.0-he774522_0.tar.bz2 Removed statsmodels-0.9.0-py37h452e1ab_0.tar.bz2 Removed sympy-1.3-py37_0.tar.bz2 Removed tblib-1.3.2-py37_0.tar.bz2 Removed terminado-0.8.1-py37_1.tar.bz2 Removed testpath-0.4.2-py37_0.tar.bz2 Removed tk-8.6.8-hfa6e2cd_0.tar.bz2 Removed toolz-0.9.0-py37_0.tar.bz2 Removed tornado-5.1.1-py37hfa6e2cd_0.tar.bz2 Removed tqdm-4.28.1-py37h28b3542_0.tar.bz2 Removed traitlets-4.3.2-py37_0.tar.bz2 Removed unicodecsv-0.14.1-py37_0.tar.bz2 Removed urllib3-1.24.1-py37_0.tar.bz2 Removed vc-14.1-h0510ff6_4.tar.bz2 Removed vs2015_runtime-14.15.26706-h3a45250_0.tar.bz2 Removed wcwidth-0.1.7-py37_0.tar.bz2 Removed webencodings-0.5.1-py37_1.tar.bz2 Removed werkzeug-0.14.1-py37_0.tar.bz2 Removed wheel-0.32.3-py37_0.tar.bz2 Removed widgetsnbextension-3.4.2-py37_0.tar.bz2 Removed wincertstore-0.2-py37_0.tar.bz2 Removed winpty-0.4.3-4.tar.bz2 Removed win_inet_pton-1.0.1-py37_1.tar.bz2 Removed win_unicode_console-0.5-py37_0.tar.bz2 Removed wrapt-1.10.11-py37hfa6e2cd_2.tar.bz2 Removed xlrd-1.2.0-py37_0.tar.bz2 Removed xlsxwriter-1.1.2-py37_0.tar.bz2 Removed xlwings-0.15.1-py37_0.tar.bz2 Removed xlwt-1.3.0-py37_0.tar.bz2 Removed xz-5.2.4-h2fa13f4_4.tar.bz2 Removed yaml-0.1.7-hc54c509_2.tar.bz2 Removed zeromq-4.2.5-he025d50_1.tar.bz2 Removed zict-0.1.3-py37_0.tar.bz2 Removed zlib-1.2.11-h62dcd97_3.tar.bz2 Removed zstd-1.3.7-h508b16e_0.tar.bz2 Removed _ipyw_jlab_nb_ext_conf-0.1.0-py37_0.tar.bz2 Cache location: D:\ruanjian\anaconda3\pkgs Will remove the following packages: D:\ruanjian\anaconda3\pkgs -------------------------- anaconda-2018.12-py37_0 59 KB blas-1.0-mkl 16 KB conda-env-2.6.0-1 6 KB dask-1.0.0-py37_0 9 KB get_terminal_size-1.0.0-h38e98db_0 8 KB msys2-conda-epoch-20160418-1 6 KB numpy-1.15.4-py37h19fb1c0_0 249 KB vc-14.1-h0510ff6_4 17 KB --------------------------------------------------- Total: 370 KB Proceed ([y]/n)? y removing anaconda-2018.12-py37_0 removing blas-1.0-mkl removing conda-env-2.6.0-1 removing dask-1.0.0-py37_0 removing get_terminal_size-1.0.0-h38e98db_0 removing msys2-conda-epoch-20160418-1 removing numpy-1.15.4-py37h19fb1c0_0 removing vc-14.1-h0510ff6_4 source cache (D:\ruanjian\anaconda3\conda-bld\src_cache) Size: 0 B git cache (D:\ruanjian\anaconda3\conda-bld\git_cache) Size: 0 B hg cache (D:\ruanjian\anaconda3\conda-bld\hg_cache) Size: 0 B svn cache (D:\ruanjian\anaconda3\conda-bld\svn_cache) Size: 0 B Total: 0 B Proceed ([y]/n)? y Removing D:\ruanjian\anaconda3\conda-bld\src_cache Removing D:\ruanjian\anaconda3\conda-bld\git_cache Removing D:\ruanjian\anaconda3\conda-bld\hg_cache Removing D:\ruanjian\anaconda3\conda-bld\svn_cache (base) C:\Users\60925>conda install conda=23.10.0 Solving environment: failed CondaValueError: Malformed version string '~': invalid character(s). (base) C:\Users\60925>conda install -c defaults conda=23.10.0 Solving environment: failed CondaValueError: Malformed version string '~': invalid character(s). (base) C:\Users\60925>为什么我的conda版本这么老?导致我根本无法更新conda,但是我使用的py必须是3.7的版本的,这是我找到的默认安装3.7版本的anaconda版本,但是安装的conda版本太老了,根本无法使用,应该如何解决?请帮我列出全部的有可能的解决方法
最新发布
06-26
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