shell腳本安裝python、pip--這種寫法是錯誤的---每一個命令執行完都要判斷是否執行成功，否則無法進行下一步

shell腳本安裝python、pip--不需要選擇安裝項目--不管用總報錯，必須帶上判斷符號，while沒有這種用法，寫在這里為了以后少走彎路,
所以不要用下面的執行了


首先把pip-18.0.tar.gz 、Python-3.6.5.tgz 安裝包放在 /usr/local 下面，按照順序先安裝pip，再安裝python。不要先安裝或只安裝python，否則很容易出錯，

#!/bin/bash
func1(){
    while true
    do
        echo "安裝依賴包"
        yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel
        echo "安裝pip"
        yum remove pip -y && cd /usr/local/ && tar -xf pip-18.0.tar.gz && cd pip-18.0/ && python setup.py install
        echo "安裝python"
        cd /usr/local/ && tar -zxvf Python-3.6.5.tgz && mv Python-3.6.5 python3 && cd python3 && ./configure && make && make install
        mv /usr/bin/python /usr/bin/python.bak
        ln -s /usr/local/bin/python3 /usr/bin/python && ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3
        whereis pip && /usr/local/bin/pip3.6 install --upgrade pip && /usr/local/bin/pip install paramiko
        sed -i "1c #!/usr/bin/python2.7" /usr/bin/yum
        sed -i "1c #!/usr/bin/python2.7" /usr/libexec/urlgrabber-ext-down
        sed -i "1c #!/usr/bin/python2.7" /usr/sbin/firewalld
      
        echo "全部安裝完畢"
        exit
    done
}
func1