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该脚本是先删除已经存在的文件，然后后台执行SQL语句将其执行结果以一定的格式写入文件
#!/bin/bashif [ -f "/var/lib/mysql/hell.txt" ]; thenrm -f /var/lib/mysql/hell.txtecho "delete /var/lib/mysql/hell.txt" >> hell.txtfimysql -uroot -plab <<EOFuse home;select YongHuID,XueYuanID into outfile './hell.txt' fields terminated by '|' lines terminated by '/r/n' from sns_home_user where YongHuID < 20;EOF
