Python 使用Paramiko读取Top命令的输出

我正在用Python编写一个脚本，用于登录到ssh并读取刚刚执行的命令的输出。我用的是paramiko软件包。我试图执行命令“top”，并在控制台上打印其输出。然而，我无法做到这一点。请查找代码段：

import sys
import time
import select
import paramiko

host = 'localhost'
i = 1

#
# Try to connect to the host.
# Retry a few times if it fails.
#
while True:
    print 'Trying to connect to %s (%i/30)' % (host, i)

    try:
        ssh = paramiko.SSHClient()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        ssh.connect(host, port=22, username='dummy', password='dummy')
        print "Connected to %s" % host
        break
    except paramiko.AuthenticationException:
        print "Authentication failed when connecting to %s" % host
        sys.exit(1)
    except:
        print "Could not SSH to %s, waiting for it to start" % host
        i += 1
        time.sleep(2)

    # If we could not connect within time limit
    if i == 30:
        print "Could not connect to %s. Giving up" % host
        sys.exit(1)

# Send the command (non-blocking)
stdin, stdout, stderr = ssh.exec_command("uname")

# Wait for the command to terminate
while not stdout.channel.exit_status_ready():
    # Only print data if there is data to read in the channel
    if stdout.channel.recv_ready():
        rl, wl, xl = select.select([stdout.channel], [], [], 0.0)
        if len(rl) > 0:
            # Print data from stdout
        print '-------------------------------'
            print stdout.channel.recv(1024)
        print '-------------------------------'

# Send the command (non-blocking)
stdin, stdout, stderr = ssh.exec_command("top -n 1")

# Wait for the command to terminate
while not stdout.channel.exit_status_ready():
    # Only print data if there is data to read in the channel
    if stdout.channel.recv_ready():
        rl, wl, xl = select.select([stdout.channel], [], [], 0.0)
        if len(rl) > 0:
            # Print data from stdout
        print '-------------------------------'
            print stdout.channel.recv(1024)
        print '-------------------------------'

# Send the command (non-blocking)
stdin, stdout, stderr = ssh.exec_command("uname")

# Wait for the command to terminate
while not stdout.channel.exit_status_ready():
    # Only print data if there is data to read in the channel
    if stdout.channel.recv_ready():
        rl, wl, xl = select.select([stdout.channel], [], [], 0.0)
        if len(rl) > 0:
            # Print data from stdout
        print '-------------------------------'
            print stdout.channel.recv(1024)
        print '-------------------------------'

#
# Disconnect from the host
#
print "Command done, closing SSH connection"
ssh.close()

输出： 正在尝试连接到本地主机（1/30）

已连接到本地主机 Linux

------------------------------- Linux

---

命令完成，关闭SSH连接

---

我不确定我哪里做错了。不过，我能够获得其他linux命令的输出。但不确定为什么top命令的输出没有被打印出来。

top

通常使用诅咒来显示，而不仅仅是打印。请尝试批处理选项的

-b

以及您拥有的

-n 1

（顶部选项因平台而异，请查看手册页）。将来，尝试进一步隔离问题-如果您在没有脚本的情况下通过

ssh

在命令行上调用

top

，您仍然会遇到问题。

如前所述

stdin, stdout, stderr = ssh.exec_command("top -b -n1")
print stdout.read()

---

工作正常。

是的，我做了。主机的

top

是否支持

-b

选项？