I've created an expect script that, when executed, ssh's onto a server and executes a series of commands. Pseudocode looks like this:
#!/usr/bin/expect
spawn ssh usr@myip
expect "password:"
send "mypassword\n";
send "./mycommand1\r"
send "./mycommand2\r"
interact
When executed from a bash shell ($ ./myscript.txt) the code executes fine. What I would now like to do is have a line in python file that runs the commands in the script the same way the bash shell does. Pseudocode looks like this:
import subprocess
def runmyscript():
subprocess.call("myscript.txt", executable="expect", shell=True)
def main():
run = runmyscript():
if __name__ == '__main__': main()
I have placed the myscript.txt script file in the same directory as my runmyscript.py file, yet when I run the python file I receive the error:
WindowsError: [Error 2] The system cannot find the file specified
I've read through the documentation on the python.org site, but to no avail. Does anyone have a cunning solution for executing bash scripts from within .py code?
SOLUTION: this code works for me.
child = subprocess.Popen(['bash', '-c', './myscript.txt'], stdout = subprocess.PIPE)
Used this code to call an Expect file to ssh and send commands to server from .py file - useful solution if you are having trouble getting pycrypto/paramiko built onto your machine.
这是你期望的脚本的Python实现：
import paramiko
user = "user"
pass = "pass"
host = "host"
client = paramiko.SSHClient()
client.load_system_host_keys()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect(host, port=22, username=user, password=pass)
client.exec_command("./mycommand1")
client.exec_command("./mycommand2")
client.close()
您可以使用Pexpect的（ http://www.noah.org/wiki/pexpect ）
这里是处理你可以运行相当多的案件为例功能通过SSH远程执行命令时进入。
import pexpect
## Cleanly handle a variety of scenarios that can occur when ssh or scp-ing to an ip:port
# amongst them are:
#
# (1) key has not been setup
# (2) key has changed since last time
# (3) command was executed (check exit status and output)
#
# @param cmdLine The "scp" or "ssh" command-line
# @param mtimeout The millisecond timeout to wait for the child process to return
# @param log The log to record events to if necessary
def cleanlyHandleSecureCmd(cmdLine, mtimeout = None, log = None):
status = -1
output = None
if mtimeout == None:
mtimeout = 60 * 1000
if cmdLine != None and ('scp' in cmdLine or 'ssh' in cmdLine):
# Scenarios for ssh include: (1) key not setup (2) key changed (3) remote cmd was executed (check exit status)
scenarios = ['Are you sure you want to continue connecting', '@@@@@@@@@@@@', EOF]
child = spawn(cmdLine, timeout = mtimeout)
scenario = child.expect(scenarios)
if scenario == 0:
# (1) key not setup ==> say 'yes' and allow child process to continue
child.sendline('yes')
scenario = child.expect(scenarios)
if scenario == 1:
if log != None:
# (2) key changed ==> warn the user in the log that this was encountered
log.write('WARNING (' + cmdLine + '): ssh command encountered man-in-the-middle scenario! Please investigate.')
lines = child.readlines()
scenario = child.expect([EOF])
child.close()
else:
# (3) remote cmd was executed ==> check the exit status and log any errors
child.close()
status = child.exitstatus
output = child.before
output = sub('\r\n', '\n', output) # Do not be pedantic about end-of-line chars
output = sub('\n$', '', output) # Ignore any trailing newline that is present
if status == None:
status = child.status
if status != 0 and log != None:
log.error('Error executing command \'' + str(cmdLine) + '\' gave status of ' + str(status) + ' and output: ' + str(output))
else:
if log != None:
log.error('Command-line must contain either ssh or scp: ' + str(cmdLine))
return (status, output)
