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HomeOperation and MaintenanceLinux Operation and MaintenanceHow to download files by date using Linux shell ftp

How to download files by date using Linux shell ftp

Sep 18, 2017 am 10:22 AM
linuxshelldownload

最近做项目遇到这样的需求要求ftp获取远程数据的文件,根据文件的创建时间点下载文件。下面小编给大家分享知识点小结,感兴趣的朋友要求看看吧

需求:ftp获取远程数据的文件,根据文件的创建时间点下载文件。 可以自行扩展根据文件的大小等其他需求。

知识点总结:

1、获取文件的时间:

ls -lrt|awk '{print $6" "$7" "$8}'

时间内容:

Sep  8 16:03

2、时间格式转换

date -d "Sep 8 16:03" +%Y%m%d%H%M

转换结果:

201709081603

3、指定文件名,正则匹配


pattern="${month}.*.dat$"
ls -lrt |awk '$9 ~ /'$pattern'/ {print $6" "$7" "$8}'

注意awk里面模式变量用'  '括起来,.*为任意字符,$表示以dat结尾。pattern的内容根据需求自行设定

4、对文件时间进行比较


ls -lrt |awk '$9 ~ /'$pattern'/ {\
     ctime="date -d \""$6" "$7" "$8"\" +%Y%m%d%H%M"; \
     ctime|getline filetime; if( filetime > '$checktime' ) print $9 ; }

获取文件的时间,对时间进行转换,然后对转换后的时间与给定的$checktime进行比较,如果比$checkime的时间大,则显示文件名。

|getline 为执行命令获取命令执行的结果。

以上就完成了对本地文件时间进行比较的方法。接下来判断远程主机的文件时间。

5、ftp命令登录远程主机,并过滤得到要查询的文件内容


ftp_cmd(){
ftp -i -n <<!
open $ftp_ip
user $get_user $get_pwd
binary
cd ${get_dir}
lcd ${local_dir}
$*
bye
!
}
pattern="${month}.*.dat$"
files=$(ftp_cmd ls -lrt |awk &#39;$9 ~ /&#39;$pattern&#39;/ {\ 
ctime="date -d \""$6" "$7" "$8"\" +%Y%m%d%H%M"; \ 
ctime|getline filetime; if( filetime > &#39;$checktime&#39; ) print $9 ; }&#39;|xargs)

通过函数调用实现ftp到指定主机,cd到指定目录,通过awk获取ls -lrt的结果,然后计算时间,把大于指定时间的文件名获取到。

6、下载文件


ftp_cmd mget $files

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