popen

来源： https://stackoverflow.com/questions/45202379/how-does-popen-work-and-how-to-implement-it-into-c-code-on-linux

来源： https://stackoverflow.com/questions/44661246/python-pass-sys-argv-when-loading-python-script-with-subprocess-popen

问题 I am trying to use Python's Popen to change my working directory and execute a command. pg = subprocess.Popen("cd c:/mydirectory ; ./runExecutable.exe --help", stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=True) buff,buffErr = pg.communicate() However, powershell returns "The system cannot find the path specified." The path does exist. If I run pg = subprocess.Popen("cd c:/mydirectory ;", stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=True) it returns the same thing.

问题 I am trying to use Python's Popen to change my working directory and execute a command. pg = subprocess.Popen("cd c:/mydirectory ; ./runExecutable.exe --help", stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=True) buff,buffErr = pg.communicate() However, powershell returns "The system cannot find the path specified." The path does exist. If I run pg = subprocess.Popen("cd c:/mydirectory ;", stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=True) it returns the same thing.

问题 How do I make Popen use a fifo named pipe as stdin? import subprocess import os import time FNAME = 'myfifo' os.mkfifo(FNAME, mode=0o777) f = os.open(FNAME, os.O_RDONLY) process = subprocess.Popen( 'wait2.sh', shell=True, stdout=subprocess.PIPE, stdin=f, stderr=subprocess.PIPE, universal_newlines=True, ) while process.poll() is None: time.sleep(1) print("process.stdin", process.stdin) If I run this script and in a terminal window echo "Something" > myfifo The process exits with process.stdin

问题 I'm currently looking at Popen to automate the compression & storage of documents. For the compression part, I thought of the following Python line: subprocess.Popen("WinRAR.exe a -r c:\\03. Notes\\AllTexts *.txt", shell=True) I keep having error messages, as the command is not able to deal with a folder name that contains a space ( 03. Notes ). This question was asked before several times, and, I must say that I tried all propositions: raw string, double quotes, triple quotes, ... None of

问题 I'm currently looking at Popen to automate the compression & storage of documents. For the compression part, I thought of the following Python line: subprocess.Popen("WinRAR.exe a -r c:\\03. Notes\\AllTexts *.txt", shell=True) I keep having error messages, as the command is not able to deal with a folder name that contains a space ( 03. Notes ). This question was asked before several times, and, I must say that I tried all propositions: raw string, double quotes, triple quotes, ... None of

问题 Honestly, I just don't understand the lingo of "non-zero" status to really interpret what's going on or what that means (it wasn't even defined) on help pages. What are some examples of using python to call other scripts in which these processes of subprocess.call subprocess.check_output subprocess.popen really differ from each other? When would you use either of those, and what are the disambiguated details of these methods? Should I be using os.system instead if I wanted simple OS calls?

问题 Honestly, I just don't understand the lingo of "non-zero" status to really interpret what's going on or what that means (it wasn't even defined) on help pages. What are some examples of using python to call other scripts in which these processes of subprocess.call subprocess.check_output subprocess.popen really differ from each other? When would you use either of those, and what are the disambiguated details of these methods? Should I be using os.system instead if I wanted simple OS calls?

问题 UPDATE 1: This question has been updated to eliminate the multithreading, simplifying its scope. The original problem popen ed in the main thread, and pclose d the child process in a different thread. The problem being asked about is reproducible much more simply, by doing the popen and pclose in the same (main) thread. Update 2: With help from responders at How to check libc version?, I think I've identified that the libc being used is uClibc 0.9.30. The following code popen s a script in