殼：標準輸入使用輸入重定向

Question

運行腳本我有此腳本myprogram

#!/bin/bash 
echo This is the first one ${1}. 
echo This is the second one ${2}. 

和輸入文件test.txt

Hi 
Hello 

，我希望用輸入重定向來運行腳本從test.txt輸入，應輸出

This is the first one Hi. 
This is the second one Hello. 

我正在嘗試使用

./myprogram < test.txt 

但它不工作。它唯一打印的是

This is the first one 
This is the second one 

任何人都可以幫我嗎？

Answer 1

位置參數（又名命令行參數）與標準輸入不相關。下面是一個使用既是一個例子：

$ cat myscript 
#!/bin/bash 
echo "These are the first two arguments: $1 and $2" 
read -r first 
echo "This is the first input line on stdin: $first" 
read -r second 
echo "This is the second input line on stdin: $second" 

$ ./myscript foo bar < test.txt 
These are the first two arguments: foo and bar 
This is the first input line on stdin: Hi 
This is the second input line on stdin: Hello