shell脚本实现TF卡升级文件

首先检查TF卡是否存在，其次检查文件是否存在，最后解压文件至指定目录。

#!/bin/bash
targe_sd_file=""

isexit='cat /proc/partitions | grep mmcblk0 | wc -l'
if [[ $isexit == '0' ]];					//检查TF卡是否存在
then
echo "no sd card detected"
exit 1
fi

sd_dri='df -h | awk '^/dev\/mmcblk0/' | sed -n 'lp' | awk'{print $6}''
echo "sd card:"
echo "$sd_dri"
cd "$sd_dri"

isexit='ls | grep pana | wc -l'
if [[ $isexit == '0' ]];				//检查文件是否存在
then
echo "no user data file"
exit 1
fi

cd /opt/
echo "updater the user program start"
tar -vxf "$sd_dri"/pana*
sync
echo "updater the user program end"