Fedora配置SSH无密码登录

    因为经常要使用SSH，每次都输入密码，特别麻烦。于是写了一下.bashrc，弄了一个function。别的不说了，直接贴上来好了。

function error()
{
    echo "Failed at $1"
    return
}
function xssh()
{
    # Prepare ssh configuration
    if ! [ -d ~/.ssh ]; then
        mkdir ~/.ssh
        touch ~/.ssh/config
        chmod 600 ~/.ssh/config
        touch ~/.ssh/known_hosts
    fi
    if ! grep -q "StrictHostKeyChecking no" ~/.ssh/config; then
        echo "StrictHostKeyChecking no" >> ~/.ssh/config
    fi
    # Command usage
    if [ -z $1 ]; then
        echo "Usage: xssh hostname [options]"
        echo "Options:"
        echo "--first Run at the first time"
    fi
    # Start ssh-agent
    if [ `ps aux | grep ssh-agent | wc -l` -ne 2 ]; then
        ssh-agent >> /dev/null
        if [ $? -ne 0 ]; then
            error "ssh-agent"
        fi
    fi
    # Generate public key
    if ! [ -f ~/.ssh/id_rsa.pub ]; then
        ssh-keygen -f ~/.ssh/id_rsa -N "" -q -t rsa
        if [ $? -ne 0 ]; then
            error "ssh-keygen"
        fi
    fi
    # Run for the first time
    if ! grep -q $1 ~/.ssh/known_hosts; then
        # Copy public key to remote machine
        ssh-copy-id root@$1 >> /dev/null
        if [ $? -ne 0 ]; then
            error "ssh-copy-id"
        fi
        # Add to ssh-agent daemon
        ssh-add ~/.ssh/id_rsa >> /dev/null
        if [ $? -ne 0 ]; then
            error "ssh-add"
        fi
    fi
    ssh -X root@$1
}

    原先的逻辑太混乱了......