关于shell提示符PS1自定义的问题

chaogle

最近捣鼓了下颜色终端，将自己的提示符弄得焕然一新:

1.             PS1="\[\e[01;31m\][\[\e[33m\]\u\[\e[32m\]@\[\e[37m\]\h:\[\e[04m\]\w\[\e[m\]\[\e[01;31m\]]\[\e[31m\] \\$\[\e[m\] "  <--- 配置提示符颜色方案
   
2.                 

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# var="\033[01m[\033[33m\u\033[32m@\033[37m\h:\033[04m\w\033[01;37m\033[24;37m]\033[34m \\$\033[0m "
   PS1=$var        <--- 效果一样但对命令行有影响
                               但会导致命令行输入字符宽度为固定的83(含提示符所在个数),并且超过83个字符后不能自动换行，而是回到行首覆盖输入的不良后果



以上问题很奇怪，还请大侠们看看，这是为什么？？？:wink:

waker

1. 
   
2. 3.4. Non-Printing Characters in Prompts
   
3. 
   
4. Many of the changes that can be made to Bash prompts that are discussed in this HOWTO use non-printing characters. Changing the colour of the prompt text, changing an Xterm title bar, and moving the cursor position all require non-printing characters.
   
5. 
   
6. If I want a very simple prompt consisting of a greater-than sign and a space:
   
7. 
   
8. [giles@nikola giles]$ PS1='> '
   
9. >
   
10. 
    
11. This is just a two character prompt. If I modify it so that it's a bright yellow greater-than sign (colours are discussed in their own section):
    
12. 
    
13. > PS1='\033[1;33m>\033[0m '
    
14. >
    
15. 
    
16. This works fine - until you type in a large command line. Because the prompt still only consists of two printing characters (a greater-than sign and a space) but the shell thinks that this prompt is eleven characters long (I think it counts '\033' , '[1' and '[0' as one character each). You can see this by typing a really long command line - you will find that the shell wraps the text before it gets to the edge of the terminal, and in most cases wraps it badly. This is because it's confused about the actual length of the prompt.
    
17. 
    
18. So use this instead:
    
19. 
    
20. > PS1='\[\033[1;33m\]>\[\033[0m\] '
    
21. 
    
22. This is more complex, but it works. Command lines wrap properly. What's been done is to enclose the '\033[1;33m' that starts the yellow colour in '\[' and '\]' which tells the shell "everything between these escaped square brackets, including the brackets themselves, is a non-printing character." The same is done with the '\033[0m' that ends the colour.

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chaogle

回复 2# waker

Thanks....:wink:

你的答案十分解惑，这里我也分享一下我查找到的相关网页资料:
http://archive09.linux.com/base/ldp/howto/HOWTO-INDEX/index.html       <--- 应该就是你上面信息的出处吧^_^

另外我在wiki百科中也找到了类似的信息:

https://wiki.archlinux.org/index.php/Color_Bash_Prompt    <--- Color Bash Prompt