是什么之间的区别command
, function
和systemcall
?
This is probably homework help, but anyhow:
A command can be a program, which in turn is comprised of functions, which themselves can execute system calls.
For example, the 'cp' command in Unix-like systems copies files. Its implementation includes functions which perform the copying. Those functions themselves execute system-calls like open() and read().
They are all just abstractions of a set of computer instructions which perform a given task.
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