a simple command line error could cost you dearly as an administrator. I saw a colleague blow away the root directory of a back-end storage server for the state of New York due to this simple oversight. Thankfully, the data and his career were recoverable...
When I first started learning the Linux command line, I found myself memorizing commands for specific scenarios. Even if it wasn’t the best command for the job, I had my way of doing things, and that worked for me. As I started working in a more professional environment around people w...
— Use apt to work with packages in the Linux command line. Use apt-get to install packages. This requires root privileges, so use the sudo command with it. For example,ifyou want to install the text editorjed(as I mentioned earlier), we can type in the command “sudo apt-get install...
The first line defines an ADMINS user alias with the two users, and the second line grants the privileges. The ALL = NOPASSWD: ALL part means that the users in the ADMINS alias can use sudo to execute commands as root. The second ALL means “any command.” The first ALL means “any...
Suppose you find yourself exploring the Linux command line for the first time or entering into Linux administration. In that case, a low-level understanding of how to get around the terminal and complete basic tasks is essential. To help you grasps those concepts, check out my previous two ar...
(ALL) ALL simply means that the superuser may also use sudo to run any command on any host. The extra (ALL) means that the superuser may also run commands as any other user. You can extend this privilege to the ADMINS users by adding (ALL) to the /etc/sudoers line, as shown at...
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命令who am i可以查看自己: ubuntu@VM-8-8-ubuntu:~$ who am i ubuntu pts/0 2023-04-02 12:09 (120.229.67.2) 配合参数-aH可以展示更多的信息: ubuntu@VM-8-8-ubuntu:~$ who -aH am i NAME LINE TIME IDLE PID COMMENT EXIT ubuntu + pts/3 2023-04-02 13:16 . 178153 (120.229.67.2) ...
The only difference between both commands is that theheadcommand prints the line from the top of the file while thetailcommand prints the lines from the bottom. The wc command Thewccommand counts the lines, words, and characters. It displays the counted number in the following sequence: Lines...
11 Command-Line Editing 12 Text Editors 13 Getting Online Help manual pages manual pages(man pages)可以查看基础命令的用法 基本用法如下: $ man ls 如果不知道完整的命令名称,可以使用关键字模糊匹配: $ man -k keyword man后面可跟数字来查看不同内容,而不仅仅是命令的使用方法。假如我们想查看/etc/passw...