如何使用子流程剪切变量？

Question

out=subprocess.check_output("""cat /etc/passwd""", universal_newlines=True, shell=True)
  for line in out.splitlines():
        elem=subprocess.check_output(["echo", "line", "|", "cut", "-d:", "-f1"], 
                                     universal_newlines=True, shell=True)
        lboxS.insert(END,elem)

Answer 1

elem=subprocess.check_output(["echo", "line", "|", "cut", "-d:", "-f1"], universal_newlines=True, shell=True)

如果您使用 shell=True，您必须为 args 传递一个字符串（就像您对 out 所做的那样）：

elem = subprocess.check_output("echo '"+line+"'|cut -d: -f1", text=True, shell=True).rstrip()

或

elem = subprocess.check_output("echo '%s'|cut -d: -f1"%line, text=True, shell=True).rstrip()

或

elem = subprocess.check_output(f"echo '{line}'|cut -d: -f1", text=True, shell=True).rstrip()

如何使用子流程剪切变量？

How can I cut a variable with subprocces?

python

shell

subprocess