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For example if i have a terminal command like this
$ hostname -I this will as a result print your ip as a string to the terminal.
I want to use the result of this command as the argv[1] argument for my c++ executable. Is there any way I can do that

shycha
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Branko Simovic
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  • @Holt, @Branko Simovic I think this question requires specifying before marking it as duplicated with: https://stackoverflow.com/questions/478898/how-to-execute-a-command-and-get-output-of-command-within-c-using-posix Do you want to know how to invoke command from the C++ code or how to redirect the output of `hostname -I` to your program as the first argument, like in: `./my_program $(hostname -I)`? – shycha Apr 24 '18 at 12:34
  • @shycha You're right, this is not at all a duplicate, I completely misread the end of the question... Seems clear to me now that what OP want is `./my_program $(hostname -I)`. – Holt Apr 24 '18 at 12:36
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    Then it is off topic here and should be asked on [Ask Ubuntu](https://askubuntu.com/) or as it is generic on [Unix & Linux](https://unix.stackexchange.com/) – Serge Ballesta Apr 24 '18 at 12:40
  • Yes, your probably right. If so, I was too fast with answering. Can you/someone delete my answer? The tag is also wrong -- this is the reason I've read it. @Holt Besides I think I also noticed a small problem with commenting on possibly duplicated question. But I'll need to look for some duplicated question to confirm it. – shycha Apr 24 '18 at 12:58

1 Answers1

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The question is not specific enough. However...

1) If you want to invoke the particular command directly from the C++ code, then follow How to execute a command and get output of command within C++ using POSIX? as Holt suggested.

2) If you want to invoke your program with the output of hostname -I, then try:

./my_program $(hostname -I)

or 

./my_program `hostname -I`
shycha
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