User Tools

Site Tools


wiki:2018_changing_the_prompt

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
wiki:2018_changing_the_prompt [2018/08/03 15:15]
david
wiki:2018_changing_the_prompt [2018/08/04 17:07] (current)
david
Line 1: Line 1:
 ====== Changing your Prompt ====== ====== Changing your Prompt ======
- +You can have your shell give you useful information by using the following sequences in the value of ''​PS1''​. I pasted this directly from the appropriate section of the BASH manual page.
-Your prompt is the string written by the shell to tell you it's OK to type some input, such as a command.+
  
 <​code>​ <​code>​
-$ command+  \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 
 +  \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
 </​code>​ </​code>​
- 
-In this class, we've been using the dollar sign '​$'​ to show you the prompt because it is a common character right before the spot you can start typing. But on the left hand side there is usually some extra info. On your own computer, for example, it may be like: 
- 
-<​code>​ 
-MyComputer:​~$ 
-</​code>​ 
- 
-This example shows another useful property of the prompt. It can tell you something about your environment,​ like the //current working directory//:​ 
- 
-<​code>​ 
-MyComputer:​~$ cd / 
-MyComputer:/​$ cd 
-MyComputer:​~$ 
-</​code>​ 
- 
-===== You can change your prompt ===== 
- 
-Try this exercise: 
- 
-<​code>​ 
-$ export PS1='>​ ' 
-> export 
-</​code>​ 
- 
- 
wiki/2018_changing_the_prompt.txt · Last modified: 2018/08/04 17:07 by david