know the return value of a native (c) program in linux

Hi folks
use this command:
echo $?
to know the return value of a native program in Linux.
try it yourself:

scenario 1:

more 
echo $? #(watch the result, it will be 1, which means unsuccess)

scenario 2:

echo "hello world" > file
more file
echo $? #(watch the result, it will be 0, means success)

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About SoCRaT

Research Support and Infrastructure Engineer, OSS & Linux Geek
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