文章作者：Tyan
博客：noahsnail.com ?|? CSDN ?|? 簡書
1. 問題描述
最近在服務(wù)器上重新安裝了一點(diǎn)東西膘魄，結(jié)果登錄的shell界面變成了顯示-bash-4.2$扰楼，顯得很丑而且使用起來十分不方便亡脸，主要是scp時需要用戶名和主機(jī)名，因此對其進(jìn)行了修改螟蒸。
2. 解決方案
修改當(dāng)前用戶的.bash_profile文件乐严，在其中加入：
export PS1='[\u@\h \W]$ '
source .bash_profile，OK测柠，問題解決。
3. 解釋
PS1是Linux終端用戶的一個環(huán)境變量缘滥，用來說明命令行提示符的設(shè)置轰胁。\u等是特殊字符，可以通過man bash命令查看完域，其意義如下：
\a an ASCII bell character (07)
\d the date in "Weekday Month Date" format (e.g., "Tue May 26")
\D{format}
the format is passed to strftime(3) and the result is inserted into the prompt string; an empty format results in a locale-specific time representation. The braces are required
\e an ASCII escape character (033)
\h the hostname up to the first `.'
\H the hostname
\j the number of jobs currently managed by the shell
\l the basename of the shell's terminal device name
\n newline
\r carriage return
\s the name of the shell, the basename of $0 (the portion following the final slash)
\t the current time in 24-hour HH:MM:SS format
\T the current time in 12-hour HH:MM:SS format
\@ the current time in 12-hour am/pm format
\A the current time in 24-hour HH:MM format
\u the username of the current user
\v the version of bash (e.g., 2.00)
\V the release of bash, version + patch level (e.g., 2.00.0)
\w the current working directory, with $HOME abbreviated with a tilde (uses the value of the PROMPT_DIRTRIM variable)
\W the basename of the current working directory, with $HOME abbreviated with a tilde
\! the history number of this command
\# the command number of this command
\$ if the effective UID is 0, a #, otherwise a $
\nnn the character corresponding to the octal number nnn
\\ a backslash
\[ begin a sequence of non-printing characters, which could be used to embed a terminal control sequence into the prompt
\] end a sequence of non-printing characters
部分特殊字符解釋如下：
\u 當(dāng)前用戶的用戶名
\h 用.分開的第一個主機(jī)名
\H 完整的主機(jī)名
\W 當(dāng)前工作目錄的目錄名软吐，只顯示路徑的最后一個目錄
\w 當(dāng)前工作目錄的目錄名瘩将，顯示全路徑
