重定向标准输入从文件中读取，同时将标准输入保留为Bash中的输入

Question

I try to build a program which asks the user for inputs all the time. To test this programm (Xtreme programming) it is a big effort to type all those inputs at every test. So I decided to write the inputs down in a file and redirect stdin to that file like

cat inputs.txt | ./myprogram cat inputs.txt | ./myprogram or ./myprogram < inputs.txt .

This works fine so far, but I wanted to be able to type other inputs myself after the file has reached EOF (also before doesn't really matter), so inputs of the first part of the program (which I already know is working) will be written automatically and I can type in the rest.

Answer 1

cat can read from multiple files, including standard input using the name "-":

cat inputs.txt - | ./myprogram

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If ./myprogram needs to run in the current shell, things get trickier. You can use process substitution:

./myprogram < <(cat inputs.txt -)

or a named pipe:

mkfifo p
cat inputs.txt - > p &
./myprogram < p