Linux Shell/bash customize

Bash tips: Colors and formatting

Easy bash prompt: http://ezprompt.net/

The current shell can be identified by using the SHELL environment variable in Linux.

echo $SHELL

For Global change: 

sudo vi /etc/bash.bashrc

For Local change: 

~/.bashrc or .bash_profile

echo $SHELL
ls -al ~/.
vi ~/.bashrc
vi /etc/bashrc
echo -e "\e[31mHello ${USER}!\e[0m"
sudo su
su ec2-user
source ~/.bashrc

$ vi ~/.bashrc
export PS1="___________________    | \w @ \h (\u) \n| => "
export PS2="| => "
$ source ~/.bash

Example 1:

echo 'FROM BASHRC'

Example 2:

export PS1='\u@\h:\w\$ '
export PS1='\u@\h:\[\033[36m\]\W\[\033[0m\] \$ '

Example 3: Welcome message

echo "Welcome ${USER} to Node1!"

Example 1: working!

echo 'Welcome to 𝗦𝘁𝗮𝗻𝗱𝗮𝗿𝗱𝘀 𝗔𝘂𝘀𝘁𝗿𝗮𝗹𝗮𝘀𝗶𝗮 𝗟𝘁𝗱.'
echo ''
export PS1='\[\e[0;2;38;5;44m\]\u\[\e[0;38;5;226m\]@\[\e[0;2;38;5;40m\]\h\[\e[0m\]:\[\e[0;2;38;5;44m\]\w \[\e[0;2;38;5;226m\]$(git branch 2>/dev/null | grep '"'"'^*'"'"' | colrm 1 2)\[\e[0;2;38;5;44m\]$ \[\e[0m\]'
Example 4: for user
export PS1="\[\e[32m\][\[\e[m\]\[\e[36m\]\u\[\e[m\]\[\e[33m\]@\[\e[m\]\[\e[32m\]\h\[\e[m\]:\[\e[36m\]\w\[\e[m\]\[\e[32m\]]\[\e[m\]\[\e[32;47m\]\\$\[\e[m\] "


Example 5: for Admin
export PS1="\[\e[32m\][\[\e[m\]\[\e[31m\]\u\[\e[m\]\[\e[33m\]@\[\e[m\]\[\e[32m\]\h\[\e[m\]:\[\e[36m\]\w\[\e[m\]\[\e[32m\]]\[\e[m\]\[\e[32;47m\]\\$\[\e[m\] "

Finally run: source ~/.bashrc

https://www.youtube.com/watch?v=nEUda6E42Lg

To show branch name in "git log" outputs

       - git config --global log.decorate auto

 

 

To show current branch name in Ubuntu Terminal type  below commands to related lines in the ~/.bashrc:

 

Find “PS1” in .bashrc like:

if [ "$color_prompt" = yes ]; then 

PS1= ...

else 

    PS1= ...

fi 

 

instead of above lines, paste blow lines

# git branch info if present

parse_git_branch() {

    git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/ (\1)/'

}

 

if [ "$color_prompt" = yes ]; then

   PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[33m\]$(parse_git_branch)\[\033[00m\]\$ '

else

   PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w$(parse_git_branch)\$ '

fi