如何阻止bash for循环执行空列表(How to stop a bash for loop from executing for an empty list)

 我使用一个简单的bash脚本从FTP服务器读取文件，转换为dos格式，然后移动到另一个文件夹： 
 
#!/bin/bash

SOURCE="$1"
DESTINATION="$2"

# Use globbing to grab list of files
for x in $1/*.txt; do
 f=$(basename $x)
 todos $x
 echo "Moving $x to $DESTINATION/$f"
 mv $x $DESTINATION/$f
done
 
 一个非常简单的问题 - 当没有要移动的txt文件时，如何停止循环执行？ 

I am using a simple bash script to read files from an FTP server, convert to dos format and then move to another folder:
 
#!/bin/bash

SOURCE="$1"
DESTINATION="$2"

# Use globbing to grab list of files
for x in $1/*.txt; do
 f=$(basename $x)
 todos $x
 echo "Moving $x to $DESTINATION/$f"
 mv $x $DESTINATION/$f
done
 
A really simple question - how do I stop the loop executing when there are no txt files to be moved?

原文：https://stackoverflow.com/questions/50711230