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#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv)
{
printf(”Hello world!\n”);
exit(0);
}
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# gcc -o hello hello.c
# ./hello
Hello wordl!
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passwd <username>
Changing passWord
for user dewang.
New UNIX passWord
:
BAD PASSWord
: it is too short
Retype new UNIX password:
passwd: all authentication tokens updated successfully.
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