Shulou(Shulou.com)06/03 Report--

This article introduces in detail the use of linux characters and redirects as well as environment variable commands, including output redirection, pipe characters, wildcard characters, escape characters, environment variables and other commands. I hope you can get something according to this article.

Output redirection

History > / root/aaa.txt:history output information in the interface, input to aaa.txt,cat aaa.txt, you can see the content displayed by the history command, but overwrite

History > > / root/aaa.txt: append

Pipe symbol

Ps-ef | grep ssh

Give the information of the first command to the second command to use.

Wildcard character

Ls / dev/sda*: view all the things that start with sda

Ls / dev/sda?: check it followed by a certain character

Ls / dev/sda [0-9]: view a single number that matches to 0-9

Escape character

Backslash\: a variable after the backslash becomes a simple string:\ $

Single quotation mark'': escapes all variables as simple strings

Double quotation marks "": keep the attributes of the variables in them without escaping

Reverse quotation mark ``: returns the result after executing the command

Environment variable

Echo $PATH

The configuration file is in / etc/profile

After editing, you need to execute source / etc/profile to refresh

These are the details of the use of linux characters and redirects and environment variable commands. Have you learned anything after reading them? If you want to know more about it, you are welcome to follow the industry information!

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