PS1

export PS1='\[\e[4;32m\]\!\[\e[m\] \[\e[0;31m\]\[\e[47m\]\u\[\e[m\] \[\e[1;37m\]\w\[\e[m\] \[\e[0;93m\][$?]\[\e[m\] \[\e[1;31m\]\$ \[\e[m\]\[\e[m\]\[\e[0;32m\]'

eg:
517 anoop ~ [0] $ cat aa
cat: aa: No such file or directory
518 anoop ~ [1] $

alias ll='ls -ltrp'
alias ..='cd ..'
alias ...='cd ../..'
alias ....='cd ../../..'
alias .....='cd ../../../..'

#export PS1='\[\e[1;32m\][\u@\h \w]\$\[\e[0m\] '
#export PS1='\[\e[0;31m\]\u\[\e[m\] \[\e[1;37m\]\w\[\e[m\] \[\e[4;32m\]\!\[\e[m\] \[\e[1;31m\]\$ \[\e[m\]\[\e[0;32m\]'
#export PS1='\[\e[4;32m\]\!\[\e[m\]\[\e[0;31m\] \[\e[47m\]\u\[\e[m\] \[\e[1;37m\]\w\[\e[m\] \[\e[0;93m\][$?]\[\e[m\]\[\e[1;31m\]\$>> \[\e[m\]\[\e[m\]\[\e[0;32m\]'
export PS1='\[\e[4;32m\]\!\[\e[m\]\[\e[0;31m\] \[\e[47m\]\u\[\e[m\] \[\e[1;37m\]\w\[\e[m\] \[\e[0;93m\][$?]\[\e[m\]\[\e[1;31m\]\$>> \[\e[m\]