ubuntu18.04自动安装ffmpeg脚本

#!/bin/bash
ffmpegTargz="/home/ffmpeg/software/ffmpeg/ffmpeg-4.4.tar.gz"
# 检查原先是否已配置java环境变量
checkExist(){
        FFMPEGBIN=`which ffmpeg`
        FFMPEGV=$(echo $FFMPEGBIN | grep "ffmpeg")
        if [[ "$FFMPEGV" != "" ]]
        then
                echo "FFMPEG已安装===================="
                exit
        fi
        if [ -e "/home/ffmpeg/software/ffmpeg/yasm-1.3.0" ];then
                echo "存在该文件夹，删除..."
                rm -rf /home/ffmpeg/software/ffmpeg/yasm-1.3.0
                cd /home/ffmpeg/software/ffmpeg
        fi
	 cd /home/ffmpeg/software/ffmpeg
	 tar -zxvf yasm-1.3.0.tar.gz
	 cd yasm-1.3.0
	 ./configure
	 make
	 make install
}
checkExist
# 查询是否有
if [ -e $ffmpegTargz ];
then
	echo "— — 存在ffmpeg压缩包 — —"
	echo "正在解压ffmpeg压缩包..."
	cd /home/ffmpeg/software/ffmpeg

	if [ -e "/home/ffmpeg/software/ffmpeg/ffmpeg-4.4" ];then
		echo "存在该文件夹，删除..."
		rm -rf /home/ffmpeg/software/ffmpeg/ffmpeg-4.4
	fi
        tar -zxvf ffmpeg-4.4.tar.gz
	cd /home/ffmpeg/software/ffmpeg/ffmpeg-4.4
	./configure --prefix=/usr/local/ffmpeg
	make
	make install
	echo "---------------------------------"

	echo "正在建立ffmpeg文件路径..."

	echo "---------------------------------"
	echo "---------------------------------"

	echo "正在配置ffmpeg环境..."

	sed -i '$a export PATH=$PATH:/usr/local/ffmpeg/bin' /etc/profile

	echo "---------------------------------"

	echo "ffmpeg环境配置已完成..."

	echo "---------------------------------"

	echo "正在重新加载配置文件..."

	echo "---------------------------------"

	source /etc/profile

	echo "配置版本信息如下："

        ffmpeg -version
else

	echo "未检测到安装包，请将安装包放到$ffmpegTargz目录下"

fi