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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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int main(int argc, char * argv[]) {
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int fd = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0666);
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while (1) {
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char buf[1024];
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size_t r = read(0, buf, 1024);
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if (r == 0) break;
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write(fd, buf, r);
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}
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}
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