[ To change the color of 'hostname' in command prompt ]
You can change the color of your shell prompt. To make your own life quite easy while working at the command prompt. Your current prompt setting is stored in a shell variable called PS1. There are other variables too, like PS2, PS3 and PS4.
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 customized by inserting a number of backslash-escaped special characters.
* Task: Display current BASH prompt (PS1)
# $ echo $PS1
Sample outputs:
[\\u@\h \\W]\\$
or
\[\e]0;\u@\h: \w\a\]${debian_chroot:+($debian_chroot)}\u@\h:\w\$
By default the command prompt is set to [\u@\h \W]\$. The backslash-escaped special characters are decoded as follows:
\u: Display the current username .
\h: Display the hostname
\W: Print the base of current working directory.
\$: Display # (indicates root user) if the effective UID is 0, otherwise display a $.
* Task: Add colors to the prompt.
To add colors to the shell prompt use the following export command syntax: '\e[x;ym $PS1 \e[m'
Where,
\e[ : Start color scheme.
x;y : Color pair to use (x;y)
$PS1 : Your shell prompt variable.
\e[m : Stop color scheme.
* To set a red color prompt, type the following command
$ export PS1="\e[0;31m[\u@\h \W]\$ \e[m "
A list of color codes
Color Code
Black-0;30
Blue-0;34
Green-0;32
Cyan-0;36
Red-0;31
Purple-0;35
Brown-0;33
Blue-0;34
Green-0;32
Cyan-0;36
Red-0;31
Purple-0;35
Brown-0;33
Note: You need to replace digit 0 with 1 to get light color version.
*Task: How do I make the prompt setting permanent?
Your new shell prompt setting set by $PS1 is temporary i.e. when you logout setting will be lost. To have it set every time you login to your workstation add above export command to your $HOME/.bash_profile file or $HOME/.bashrc file.
$ cd
$ vim .bash_profile
or
$ vim $HOME/.bashrc
add this line in the end of the this file.
export PS1="\e[0;31m[\u@\h \W]\$ \e[m"
(save and quit from the file )
This will permanent color change
---------------------------------------------------------------------------------
For RHEL/Centos
go to the file
#vim .bashrc
and edit in end of the page this line:-
export PS1="\e[0;34m[\u\[\033[0;36m\]@\[\033[0;31m\]\h\[\033[0;33m\] \w]# \e[m"
[ and save and quit the file ]
------------------------------------------------
For Ubuntu
*************
go to the file
$vim .bashrc
#force_color_prompt=yes [ remove the '#' singh from the line ]
use this line :-
if [ "$color_prompt" = yes ]; then
PS1='${debian_chroot:+($debian_chroot)}\[\033[0;32m\]\u\[\033[0;34m\]@\[\033[0;36m\]\h\[\033[0;31m\]:\[\033[0;33m\]\w\[\033[00m\]\$ 'else
PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$
[ after this save and quit the file ]
--------------------------------------------------------------------------------------------------------------------------
You can change the color of your shell prompt. To make your own life quite easy while working at the command prompt. Your current prompt setting is stored in a shell variable called PS1. There are other variables too, like PS2, PS3 and PS4.
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 customized by inserting a number of backslash-escaped special characters.
* Task: Display current BASH prompt (PS1)
# $ echo $PS1
Sample outputs:
[\\u@\h \\W]\\$
or
\[\e]0;\u@\h: \w\a\]${debian_chroot:+($debian_chroot)}\u@\h:\w\$
By default the command prompt is set to [\u@\h \W]\$. The backslash-escaped special characters are decoded as follows:
\u: Display the current username .
\h: Display the hostname
\W: Print the base of current working directory.
\$: Display # (indicates root user) if the effective UID is 0, otherwise display a $.
* Task: Add colors to the prompt.
To add colors to the shell prompt use the following export command syntax: '\e[x;ym $PS1 \e[m'
Where,
\e[ : Start color scheme.
x;y : Color pair to use (x;y)
$PS1 : Your shell prompt variable.
\e[m : Stop color scheme.
* To set a red color prompt, type the following command
$ export PS1="\e[0;31m[\u@\h \W]\$ \e[m "
A list of color codes
Color Code
Black-0;30
Blue-0;34
Green-0;32
Cyan-0;36
Red-0;31
Purple-0;35
Brown-0;33
Blue-0;34
Green-0;32
Cyan-0;36
Red-0;31
Purple-0;35
Brown-0;33
Note: You need to replace digit 0 with 1 to get light color version.
*Task: How do I make the prompt setting permanent?
Your new shell prompt setting set by $PS1 is temporary i.e. when you logout setting will be lost. To have it set every time you login to your workstation add above export command to your $HOME/.bash_profile file or $HOME/.bashrc file.
$ cd
$ vim .bash_profile
or
$ vim $HOME/.bashrc
add this line in the end of the this file.
export PS1="\e[0;31m[\u@\h \W]\$ \e[m"
(save and quit from the file )
This will permanent color change
---------------------------------------------------------------------------------
For RHEL/Centos
go to the file
#vim .bashrc
and edit in end of the page this line:-
export PS1="\e[0;34m[\u\[\033[0;36m\]@\[\033[0;31m\]\h\[\033[0;33m\] \w]# \e[m"
[ and save and quit the file ]
------------------------------------------------
For Ubuntu
*************
go to the file
$vim .bashrc
#force_color_prompt=yes [ remove the '#' singh from the line ]
use this line :-
if [ "$color_prompt" = yes ]; then
PS1='${debian_chroot:+($debian_chroot)}\[\033[0;32m\]\u\[\033[0;34m\]@\[\033[0;36m\]\h\[\033[0;31m\]:\[\033[0;33m\]\w\[\033[00m\]\$ 'else
PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$
[ after this save and quit the file ]
--------------------------------------------------------------------------------------------------------------------------
