Bash shell 提供了许多转义序列，可以插入到提示符中。摘自 Bash 2.04 手册页
When executing interactively, bash displays the primary
prompt PS1 when it is ready to read a command, and the
secondary prompt PS2 when it needs more input to complete
a command. Bash allows these prompt strings to be cus�
tomized by inserting a number of backslash-escaped special
characters that are decoded as follows:
\a an ASCII bell character (07)
\d the date in "Weekday Month Date" format
(e.g., "Tue May 26")
\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
\u the username of the current user
\v the version of bash (e.g., 2.00)
\V the release of bash, version + patchlevel
(e.g., 2.00.0)
\w the current working directory
\W the basename of the current working direc�
tory
\! 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
\[ begin a sequence of non-printing characters,
which could be used to embed a terminal con�
trol sequence into the prompt
\] end a sequence of non-printing characters |
对于长期用户，请注意新的\j和\l序列：这些是在 2.03 或 2.04 中新增的。
继续我们之前的内容
[giles@nikola giles]$ PS1="\u@\h \W> " giles@nikola giles> ls bin mail giles@nikola giles> |
这类似于大多数 Linux 发行版的默认设置。 我想要稍微不同的外观，所以我将其更改为
giles@nikola giles> PS1="[\t][\u@\h:\w]\$ " [21:52:01][giles@nikola:~]$ ls bin mail [21:52:15][giles@nikola:~]$ |