站長資訊網假設讀取的文件為當期目錄下的 test.txt 文件，內容如下：
Google Runoob Taobao
實例 1
#!/bin/bash
while read line
do
echo $line
done < test.txt
執行輸出結果為：
Google Runoob Taobao
實例 2
#!/bin/bash
cat test.txt | while read line
do
echo $line
done
執行輸出結果為：
Google Runoob Taobao
實例 3
for line in `cat test.txt`
do
echo $line
done
do
echo $line
done
執行輸出結果為：
Google Runoob Taobao
for 逐行讀和 while 逐行讀是有區別的，如:
$ cat test.txt
Google
Runoob
Taobao
Runoob
Taobao
$ cat test.txt | while read line; do echo $line; done
Google
Runoob
Taobao
$ for line in $(<test.txt); do echo $line; done
Google
Runoob
Taobao
