I want to execute the following Shell Command in a python script:
我想在python脚本中执行以下Shell命令:
dom=myserver
cat /etc/xen/$myserver.cfg | grep limited | cut -d= -f2 | tr -d \"
I have this:
我有这个:
dom = myserver
limit = subprocess.call(["cat /etc/xen/%s.cfg | grep limited | cut -d= -f2", str(dom)])
subprocess.call(['/root/bin/xen-limit', str(dom), str(limit)])
It does not work, but I don't know why..
它不起作用,但我不知道为什么..
Update:
c1 = ['cat /etc/xen/%s.cfg']
p1 = subprocess.Popen(c1, stdout=subprocess.PIPE)
c2 = ['grep limited']
p2 = subprocess.Popen(c2, stdin=p1.stdout, stdout=subprocess.PIPE)
c3 = ['cut -d= -f2']
p3 = subprocess.Popen(c3, stdin=p2.stdout, stdout=subprocess.PIPE)
c4 = ['tr -d \"']
p4 = subprocess.Popen(c4, stdin=p3.stdout, stdout=subprocess.PIPE)
result = p4.stdout.read()
limit = subprocess.call([result])
subprocess.call(['/root/bin/xen-limit', str(dom), str(limit)])
2 个解决方案
#1
8
You can glue several subprocesses together:
您可以将多个子进程粘合在一起:
c1 = ['ls']
p1 = subprocess.Popen(c1, stdout=subprocess.PIPE)
c2 = ['wc']
p2 = subprocess.Popen(c2, stdin=p1.stdout,
stdout=subprocess.PIPE)
result = p2.stdout.read()
Notice how we've set the stdin of p2 to be the stdout of p1.
注意我们如何将p2的stdin设置为p1的stdout。
EDIT: simplified the example
编辑:简化了示例
#2
1
Made it! :D Thanks
做好了! :D谢谢
dom = myserver
c1 = ['/bin/cat', '/etc/xen/%s.cfg' % (str(dom))]
p1 = subprocess.Popen(c1, stdout=subprocess.PIPE)
c2 = ['grep', 'limited']
p2 = subprocess.Popen(c2, stdin=p1.stdout,
stdout=subprocess.PIPE)
c3 = ['cut', '-d=', '-f2']
p3 = subprocess.Popen(c3, stdin=p2.stdout,
stdout=subprocess.PIPE)
c4 = ['tr', '-d', '\"']
p4 = subprocess.Popen(c4, stdin=p3.stdout,
stdout=subprocess.PIPE)
result = p4.stdout.read()
subprocess.call(['/root/bin/xen-limit', str(dom), str(result)])
#1
8
You can glue several subprocesses together:
您可以将多个子进程粘合在一起:
c1 = ['ls']
p1 = subprocess.Popen(c1, stdout=subprocess.PIPE)
c2 = ['wc']
p2 = subprocess.Popen(c2, stdin=p1.stdout,
stdout=subprocess.PIPE)
result = p2.stdout.read()
Notice how we've set the stdin of p2 to be the stdout of p1.
注意我们如何将p2的stdin设置为p1的stdout。
EDIT: simplified the example
编辑:简化了示例
#2
1
Made it! :D Thanks
做好了! :D谢谢
dom = myserver
c1 = ['/bin/cat', '/etc/xen/%s.cfg' % (str(dom))]
p1 = subprocess.Popen(c1, stdout=subprocess.PIPE)
c2 = ['grep', 'limited']
p2 = subprocess.Popen(c2, stdin=p1.stdout,
stdout=subprocess.PIPE)
c3 = ['cut', '-d=', '-f2']
p3 = subprocess.Popen(c3, stdin=p2.stdout,
stdout=subprocess.PIPE)
c4 = ['tr', '-d', '\"']
p4 = subprocess.Popen(c4, stdin=p3.stdout,
stdout=subprocess.PIPE)
result = p4.stdout.read()
subprocess.call(['/root/bin/xen-limit', str(dom), str(result)])