append

#!/bin/bash
file=$HOME'/.bashrc'
line=$(grep -rn -w 'alias '$1 $file | cut -d : -f 1)
exist=$(grep -w 'alias '$1 $file)
command="${@:2}"
alias=$1


if [ -z $1 ]
then
	echo -e "\e[31mformat is \e[33;1m<alias> <command>\e[0m"
else
	if [ -z $line ]
	then
		echo -e '\e[32mRunning "'$alias'" will call "'$command'"\e[0m'
		echo 'alias' $alias'="'$command'"' >>~/.bashrc
		exec bash

	else
		echo $1 "currently calls:"
		echo $exist | grep -o '".*"' | tr -d '"'
		echo "would you like to  overwrite with" $command "? (y/n)"
		read overwrite
		if [ $overwrite = y ]
		then
			sed -i.bak -e $line'd' $file
			echo 'Running "'$alias'" will call "'$command'"'
	                echo 'alias' $alias'="'$command'"' >>~/.bashrc
                	exec bash

		else
			echo 'Running "'$alias'" will still call "'$exist | grep -o '".*"' | tr -d '"''"'
		fi
	fi
fi