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I am coding in C and running the programs in a Linux terminal. I want to save the output of the program in a .txt file. I usually do this by executing ./a.out>filename.txt

But I have written an interactive program in which I have to enter a number to initiate the program. In that case how do I do it?

Thanks a lot and your valuable suggestions are most welcomed.

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4 Answers 4

Reset to default
8

Try this

./a.out | tee filename.txt

Tee man page

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3 Comments

This doesn't allow access to stdin for inputting the args
actually ur suggestion works when the code is not interactive but when it requires some input from our side..it dsnt word...anyways thnx for your reply
thnx finally it worked coz of ur suggestion actually i made mistake while typing innitially..thanx buddy once again
7

You can use script to capture all output to a file.

$ man script

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6

Move the requirement to enter a number from the terminal to a command line parameter.

./a.out 42 > filename.txt

Or, easier, accept the input from a redirected input

echo 42 | ./a.out > filename.txt
./a.out < input.txt > filename.txt
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1

Assuming you have enter the number you wish to pass the to the program in an file called 'input.txt'. If you want to re-direct the output to 'output.txt', then type at the command-line:

./a.out  <  input.txt  >  output.txt
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