I want to know, do only compiler based languages use a entry point, or if a interpreter based language can also use entry points, if yes then please give 1 example.

CodePudding user response：

I shell scripts starts at the beginning of the script file. A python program starts at the beginning of the python file. In both cases you can call that the "entry" point.

The decision, if a program starts at the beginning of the file (like in both the examples above) or starts at a specific function (like main) has nothing to do with the decision to make a language compiled or interpreted. It is a mere language design consideration.

Addition
It is actually a quite common for example in python to do something like

# include statements and
# class definitions and
# function definitions go here

def main():
    pass    
    #do main stuff here

if __name__ == "__main__":
    main()

This defines a main function and the first non-definition statement calls it, if the module is the main program file.

CodePudding user response：

A typical way a program is started in Linux is by a shell calling fork execve. The new process is loaded and begins execution at the entry point specified by the format of the executable; for example ELF. In the case of an interpreted language, the executable is the interpreter specified on the first line after #! such as /usr/bin/python.