Change bash prompt color by setting PS1 variable under Linux

We all know that in bash, you can change the color of the prompt by PS1 variables. When the command output is long, it is often not easy to see where the output begins at the first glance, change the PS1 variable by changing it, you can change the color of the bash prompt so that you can look at the crowd and find where the output begins. Also, setting colors can make the command line more beautiful

We can change the content of Bash's prompt by setting the PS1 variable, as follows:

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After changing the contents of the PS1 variable, the bash prompt follows the changes. The PS1 variable can also use the backslash "\" to display the contents of a similar variable, knowing that the backslash escaped should be unfamiliar, as follows:

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Adding "\u" to the PS1, the user name of the current user appears in the bash prompt. There are a number of similar escapes, such as "\ T" and "\ T" for the current time (the two are slightly different in time format and "\w" represents the current directory.) The content of the specific prompt can be seen in the "prompting" section of "Man bash".

The PS1 variable can not only change the content of the prompt, but also change the color of the prompt. Just add "\e" to the PS1.

The format of the prompt color is: \e[font style; font color; background color m

The format at which the prompt color ends is: \e[0m

Font style, font color, background color Three in the middle of the use of English half-width semicolon separated, all three are digital code

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123456789101112

字体样式代码：0        OFF1        高亮显示2        3        4        下划线5        闪烁67        反色8        不可见#有些代码没有对应的效果，就是和0一样

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1234567891011

字体及背景颜色代码：字体    背景    颜色30      40     黑色31      41     红色32      42     绿色33      43     ***34      44     蓝色35      45     紫色36      46     青色37      47     白色

You can use the ' echo-e ' \e[x;y;zm xxx \e[0m ' command to view the display effect as follows:

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You can use ECHO-E to try it out and know what color you like.

After you have your own color and prompt, use "\e[0m" to end it so that the command does not receive the effect of the color.

But the light is still not perfect. When the command is long, more than one line, the command will not wrap, but will overwrite the current line of the prompt! As follows:

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To avoid this, surround the non-display portion of the PS1 variable with Escape "\[" and "\]", which tells Bash that the enclosed character does not occupy space on the line, so that the word wrap will work correctly. Otherwise, it will cause problems.

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This will be able to use the normal, feel that their color is very good, you should quickly write to the configuration file go to it

Below I share a ps1= "\[\e[36m\][\[\e[36m\]\u\[\e[0m\]@\h \[\e[32m\]\w\[\e[36m\]]\[\e[0m\]\\$" pasted into the/ETC/BASHRC file in the following location

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The brackets and the username are Green and the command is too long to overwrite the previous line, without the background color defined, even if your background is white!

This article is from the "Professor" blog, please be sure to keep this source http://professor.blog.51cto.com/996189/1572141

Change bash prompt color by setting PS1 variable under Linux