Custom Function for Creating Permanent Alias in Ubuntu

permanent_alias.md

Here is a function named peras that you can add to your ~/.bashrc file:

function peras() {
    local force=0
    if [ "$1" = "-f" ]; then
        force=1
        shift
    fi

    if [ -z "$1" ] || [ -z "$2" ]; then
        echo "Error: Both alias name and command are required"
        return 1
    fi

    if grep -q "^alias $1=" ~/.bash_aliases; then
        if [ $force -eq 1 ]; then
            sed -i "/^alias $1=/d" ~/.bash_aliases
            echo "alias $1='$2'" >> ~/.bash_aliases
            source ~/.bash_aliases
        else
            echo "Error: Alias $1 already exists. Use -f option to overwrite"
            return 1
        fi
    else
        echo "alias $1='$2'" >> ~/.bash_aliases
        source ~/.bash_aliases
    fi
}

This function takes two arguments: the alias name and the command. If either of these arguments is missing, the function will return an error message. If the alias already exists in the ~/.bash_aliases file, the function will check if the -f option was used. If it was, the function will overwrite the existing alias with the new command. If the -f option was not used, the function will return an error message. If the alias does not exist, the function will append it to the ~/.bash_aliases file. Finally, the function will source the ~/.bash_aliases file to make the new alias available immediately.