Linux shell控制台改变显示前缀
同样是linux，为什么shell登录后显示的前缀会不同呢，有些显示包含当前的用户名、主机名等信息，而有些仅显示一个#，如下图：
其实，shell登陆后具体显示的内容由环境变量”PS1″控制，我们可以
echo $PS1查看一下当前的”PS1″环境变量的内容
通过修改用户的“home”目录下的.bashrc配置文件，添加内容
export PS1=”\u@\h \w> ”或修改全局配置文件”/etc/profile”
具体的配置内容见这篇文章：
http://www.thegeekstuff.com/2008/09/bash-shell-ps1-10-examples-to-make-your-linux-prompt-like-angelina-jolie/
文章目录 [显示]
1. Display username, hostname and current working directory in the prompt
The PS1 in this 0 example displays the following three information in the prompt:
\u – Username
\h – Hostname
\w – Full path of the current working directory
-bash-3.2$ export PS1=”\u@\h \w> “
ramesh@dev-db ~> cd /etc/mail
ramesh@dev-db /etc/mail>
2. Display current time in the prompt
In the PS1 environment variable, you can directly execute any Linux command, by specifying in the format $(linux_command). In the following example, the command $(date) is 0 executed to display the current time inside the prompt.
ramesh@dev-db ~> export PS1="\u@\h [\$(date +%k:%M:%S)]> "
ramesh@dev-db [11:09:56]>
You can also use \t to display the current time in the hh:mm:ss format as shown below:
ramesh@dev-db ~> export PS1="\u@\h [\t]> "
ramesh@dev-db [12:42:55]>
You can also use \@ to display the current time in 12-hour am/pm format as shown below:
ramesh@dev-db ~> export PS1="[\@] \u@\h> "
[04:12 PM] ramesh@dev-db>- Display output of any Linux command in the prompt
You can display output of any Linux command in the prompt. The following example displays three items separated by | (pipe) in the command prompt:
\!: The history number of the command
\h: hostname
$kernel_version: The output of the uname -r command from $kernel_version variable
\$?: Status of the last command
ramesh@dev-db ~> kernel_version=$(uname -r)
ramesh@dev-db ~> export PS1="\!|\h|$kernel_version|\$?> "
473|dev-db|2.6.25-14.fc9.i686|0>- Change foreground color of the prompt
Display prompt in blue color, along with username, host and current directory information
$ export PS1="\e[0;34m\u@\h \w> \e[m"
[Note: This is for light blue prompt]
$ export PS1="\e[1;34m\u@\h \w> \e[m"
[Note: This is for dark blue prompt]
\e[ – Indicates the beginning of color prompt
x;ym – Indicates color code. Use the color code values mentioned below.
\e[m – indicates the end of color promptColor Code Table:
Black 0;30
Blue 0;34
Green 0;32
Cyan 0;36
Red 0;31
Purple 0;35
转载自 吴川斌的博客 http://www.mr-wu.cn/