Is there a Python equivalent to the ‘which’ command [duplicate]

Python 3.3 added shutil.which() to provide a cross-platform means of discovering executables: Return the path to an executable which would be run if the given cmd was called. If no cmd would be called, return None. Sample calls: >>> shutil.which(“python”) ‘/usr/local/bin/python’ >>> shutil.which(“python”) ‘C:\\Python33\\python.EXE’ Unfortunately, this has not been backported to 2.7.x.

When should the option RemainAfterExit needs to be set true when creating new systemd services?

Use RemainAfterExit=yes for services, which somehow change state of the system. When you want that state reverted, you just stop the service. Then you can start it again, but not without first stopping it. An example would be service which creates a flag in filesystem to be used by some other application. When started, it …

Read more

Difference between physical/logical/virtual memory address

My answer is true for Intel CPUs running on a modern Linux system, and I am speaking about user-level processes, not kernel code. Still, I think it’ll give you some insight enough to think about the other possibilities Address Types Regarding question 3: I have come across discussion that virtual and logical addresses/address space are …

Read more

I/O concept flush vs sync

In Java, the flush() method is used in output streams and writers to ensure that buffered data is written out. However, according to the Javadocs: If the intended destination of this stream is an abstraction provided by the underlying operating system, for example a file, then flushing the stream guarantees only that bytes previously written …

Read more

Is it possible to create an operating system using Python? [closed]

Unfortunately Python is classified as a very high level programming language. It cannot be used, for example, to directly access hardware and perform low-level data structure manipulation. It is completely dependent on something to abstract the hardware from it, and that is the Kernel. It is, however, technically possible to create an operating system centered …

Read more