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How to modify the Bash Shell prompt format and color matching, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, I hope you can get something.

Read the shell prompt that most of us use, showing the user name, hostname, and current directory. Here will show you how to customize a Bash you like.

Learn about BASH

The prompt for shell is controlled by a special shell variable PS1. There are other variables, such as PS2, PS3, and PS4. Bash displays the first prompt variable PS1 when it is ready to read the command.

When it needs more input to complete a command, it displays the second prompt variable PS2.

Bash allows you to customize these prompt strings by inserting some special characters escaped by "backslash"\.

Show the current Bash prompt

[root@localhost ~] # echo $PS1 [\ u @\ h\ W]\ $

Each escaped special character is interpreted as follows:

\ U: show current user

\ h: show hostname

\ W: print the current directory

\ $: if the valid UID is 0, display # (referring to root users), otherwise display $(referring to ordinary users)

Modify the Bash prompt

If you want to make the modified shell prompt permanent, you can write the variable in the .bashrc file under the home directory. To take effect globally and for all users to take effect, you can write it in / etc/bash.bashrc or / etc/bashrc configuration file.

For example: display the user name, hostname, absolute path of the directory in the prompt, display the current time of the 24-hour system, and save the command to the ~ / .bashrc file. :

[root@localhost ~] # echo 'export PS1= "[\\ u@\ h\\ W\ A]\\ $" > ~ / .bashrc [root@localhost ~] # source ~ / .bashrc [root@localhost ~ 11:28] #

The following are common special characters:

\ U: show current user

\ w: print the absolute path of the current directory

\ W: print the current directory

\ h: show hostname

\ h: show fully qualified domain names

\ a: show the current time 24-hour system

\ @: show the current time 12-hour system

\ $: if the valid UID is 0, display # (referring to root users), otherwise display $(referring to ordinary users)

\ j: number of jobs currently managed by shell

Add colors to the Bash prompt

The following are commonly used color matching, such as changing font color, changing it to bold, adding underscore, setting background color, and so on:

'\ e [0bot 30m' # black'\ e [0bot 31m'# red'\ e [0bot 32m'# green'\ e [0bot 33m'# yellow'\ e [0bot 34m'# blue'\ e [0transfer35m'# purple'\ e [01036m'# cyan'\ e [0X 37m'# white'\ e [1x 30m'# black bold'\ e [1 31m'# Red Bold'\ e [1bot 32m'# Green Bold'\ e [1x 33m'# Yellow Bold'\ e [1x 34m'# Blue Bold'\ e [1x 36m'# Cyan Bold'\ e [1X 37m'# White Bold'\ e [4X 30m'# Black underline'\ e [4 31m'# red underline'\ e [4x 32m'# green underline'\ e [4x 33m'# yellow underline'\ e [4x 34m'# blue underline'\ e [4x 35m'# purple underline'\ e [4bot 36m'# cyan underline'\ e [4 37m'# White underline'\ e [40m'# black background'\ e [41m'# red background'\ e [42m'# green background'\ e [43m' # yellow background'\ e [44m' # blue background'\ e [45m' # purple background'\ e [46m' # cyan background'\ e [47m' # white Background'\ e [0m'# reset to the default value

Here is the color scheme. You can add your favorite to the ~ / .bashrc file and let it take effect:

[root@localhost ~ 15:49] # export PS1= "\ e [0; 30m [\\ u@\\ h\\ W]\\ $\ e [m" [root@localhost ~] # export PS1= "\ e [0; 31m [\ root@localhost ~] # export PS1="\ e [0; 32m [\ u @\\ h\ W]\ $\ e [m "[root@localhost ~] # export PS1="\ e [0 33m [\\ u @\\ h\\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [0; 34m [\ u @\\ h\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [0; 35m [\ u @\ h\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [0 36m [\\ u @\\ h\\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [0; 37m [\ u @\ h\ W]\\ $\ e [m "[root@localhost ~] # [root@localhost ~] # export PS1="\ e [1; 30m [\ u @\ h\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [1] 31m [\\ u @\\ h\\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [1; 32m [\ u @\ h\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [1; 33m [\ u @\ h\ W]\ $\ e [m "[root@localhost ~] # export PS1="\ e [1] 34m [\\ u @\\ h\\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [1; 35m [\ u @\\ h\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [1; 36m [\ u @\ h\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [1] 37m [\\ u@\ h\\ W]\\ $\ e [m "[root@localhost ~] # [root@localhost ~] # export PS1="\ e [4; 30m [\ root@localhost ~] # export PS1= "\ e [4; 31m [\ u @\ h\ W]\\ $\ e [m" [root@localhost ~] # export PS1= "\ e [4 32m [\\ u @\\ h\\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [4; 33m [\ u @\\ h\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [4; 34m [\ u @\ h\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [4] 35m [\\ u @\\ h\\ W]\ $\ e [m "[root@localhost ~] # export PS1="\ e [4; 36m [\ u @\\ h\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [4 37m [\\ u@\\ h\\ W]\\ $\ e [m "[root@localhost ~] # [root@localhost ~] # export PS1="\ e [40m [\\ u@\\ h\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [41m [\ u@\\ h\ W]\ $\ e [m "[root@localhost ~] # export PS1="\ e [42m [\\ u@\\ u@\ \ h\\ W]\\ $\ e [m "[root@localhost ~] # export PS1="\ e [43m [\\ u@\\ h\\ W]\ $\ e [m "[root@localhost ~] # export PS1="\ e [44m [\\ u@\\ h\ W]\ $\ e [m "[root@localhost ~] # export PS1="\ e [45m [\ u@\\ h\ W]\\ $\ e [m "[ Root@localhost ~] # export PS1= "\ e [46m [\ u @\ h\ W]\\ $\ e [m" [root@localhost ~] # export PS1= "\ e [47m [\ u @\ h\ W]\ $\ e [m" [root@localhost ~] # export PS1= "\ e [0m [\ u @\\ h\ W]\\ $\ e [m"

If you want each part of the prompt to display a different color, here's an example:

[root@localhost log#] export PS1= "\ e [35m [\ u\ e [m @\ e [36m\\ h\ e [33m\ W]\ e [1meme33m\\ $\ e [m"

The command explains:

"[\ e [35m [\ u: add brackets" at the beginning, and the user part of the current login is in a purple font.

\ e [masking: "@" symbol does not give color matching, use default color

\ e [36m\\ h: cyan is used in the host name section.

\ e [33m\\ W]: the current directory is yellow, followed by brackets "]"

\ e [1jue 33m\\ $\ e [m ": bold $symbol, use yellow color

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