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File Descriptors after fork()
-------------------------------

When opening a file::
    
    fcntl(fd, F_SETFD, FD_CLOEXEC);

In python, you can pass the ``close_fds`` argument to subprocess.Popen() to
close all file descriptors just after fork().

date in seconds-since-epoch
-----------------------------

From the command line:

    date '+%s'