The Prompt Variable
-------------------
```bash
user@ubuntu:~# echo $PS1
${debian_chroot:+($debian_chroot)}\\[\033[01;32m\\]\u@\h\\[\033[00m\\]:\\[\033[01;34m\\]\w\\[\03300m\\]\$
```
Making Sense of the Above
-------------------------
### Flags
| Flag | What it shows |
|--------|------------------------------------------------------------------------------------------------------------------|
| `\a` | ASCII bell character (07) |
| `\d` | date in "Weekday Month Date" format (e.g., "Tue May 26") |
| `\e` | ASCII escape character (033) |
| `\h` | hostname up to the first `.’ |
| `\H` | hostname |
| `\n` | newline |
| `\r` | return |
| `\s` | name of the shell, the basename of $0 (the portion following the final slash) |
| `\t` | current time in 24-hour HH:MM:SS format |
| `\T` | current time in 12-hour HH:MM:SS format |
| `\@` | current time in 12-hour am/pm format |
| `\u` | username of the current user |
| `\v` | version of bash (e.g., 2.00) |
| `\V` | release of bash, version + patchlevel (e.g., 2.00.0) |
| `\w` | current working directory |
| `\W` | basename of the current working direc-tory |
| `\!` | history number of this command |
| `\#` | command number of this command |
| `\$` | the effective UID is 0, a #, otherwise a $ |
| `\nnn` | character corresponding to the octal number nnn |
| `\\` | backslash |
| `\[` | a sequence of non-printing characters, which could be used to embed a terminal con-trol sequence into the prompt |
| `\]` | a sequence of non-printing characters |
### Colors
Here's a color table.
| Color | Code |
|--------------|--------|
| Black | `0;30` |
| Dark Gray | `1;30` |
| Blue | `0;34` |
| Light Blue | `1;34` |
| Green | `0;32` |
| Light Green | `1;32` |
| Cyan | `0;36` |
| Light Cyan | `1;36` |
| Red | `0;31` |
| Light Red | `1;31` |
| Purple | `0;35` |
| Light Purple | `1;35` |
| Brown | `0;33` |
| Yellow | `1;33` |
| Light Gray | `0;37` |
| White | `1;37` |
To color anything,
* Prefix with `[33[m\]`
* Suffix with `\[33[00m\]`
For example, to color the directory's basename (`\W`) yellow (`1;33`),
you'd have this:
```bash
# Exploded to illustrate
[33[01;33m\] \W \\[33[00m\\]
# Together
[33[01;33m\]\W\\[33[00m\\]
```