How to check and change environment variables in C

This is a discussion on How to check and change environment variables in C within the Linux Programming forums, part of the Platform Specific Boards category; Hi, I want to know how can I change and check environment variables in a C program. For instance I ...

  1. #1
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    How to check and change environment variables in C

    Hi,

    I want to know how can I change and check environment variables in a C program. For instance I want to check $HOME or $PATH an change them

    Thanks in advance

  2. #2
    Crazy Fool Perspective's Avatar
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    getenv() and setenv()

    check your man pages for these functions.

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    It's putenv().

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    Crazy Fool Perspective's Avatar
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    Quote Originally Posted by jim mcnamara
    It's putenv().
    setenv() gives you more control, check your man pages

  5. #5
    and the hat of wrongness Salem's Avatar
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    But neither of them change the parent environment.

    If you program does putenv("PATH=foo");
    Then running the program does NOT change the PATH in your shell.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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    Because you are running in a child process.

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    Thanks guys. Linux rules

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