Several Methods for executing shell

Several Methods for executing shell

This section describes four methods for python to execute shell commands:

1. the OS. system () function in the OS module executes shell commands.

Note: This method cannot be output by shell commands.

2. popen () # The result of executing the command is a string. You need to process it yourself to obtain the desired information.

The result is the same as that of the first method.

3. commands Module # It is convenient to obtain command output (including standard and error output) and execution status bit.

Commands. getstatusoutput (cmd) returns (status, output)

Commands. getoutput (cmd) returns only output results

Commands. getstatus (file) returns the execution result string of the ls-ld file and calls getoutput. This method is not recommended.

4. subprocess Module

The subprocess module can be used to create a new process. It can connect to the input, output, and error pipelines of the new process, and obtain the return status of the new process execution. The subprocess module is used to replace OS. system () and OS. popen.(), Commands.And other old functions or modules.

Import subprocess 1, subprocess. call (command, shell = True) # The result is printed directly. 2. subprocess. popen (command, shell = True) ### it can also be subprocess. popen (command, stdout = subprocess. PIPE, shell = True) # You can output the result.

If the command is not an executable file, shell = True cannot be omitted.

Shell = True: Execute command in shell

You can execute shell commands in all four methods.

Pysftp-friendly command execution and interaction tools

  
  

   
   
import pysftp with pysftp.Connection('hostname', username='me', password='secret') as sftp: with sftp.cd('public'): 
   
   
 # temporarily chdir to public 
   
   
 sftp.put('/my/local/filename') # upload file to public/ on remote 
   
   
 sftp.get('remote_file') 
   
   
 # get a remote file 
  
  

All methods

  
  
  

   
   
dir(pysftp.Connection) ['class', 'del', 'delattr', 'dict', 'doc', 'enter', 'exit', 'format', 
   
   
'getattribute', 'hash', 'init', 'module', 'new', 'reduce', 'reduce_ex', 'repr', 'setattr', 'sizeof', 
   
   
 'str', 'subclasshook', 'weakref', 'set_authentication', 'set_logging', 'set_username', 'sftp_connect', '_start_transport', 
   
   
 'active_ciphers', 'active_compression', 'cd', 'chdir', 'chmod', 'chown', 'close', 'cwd', 'execute', 'exists', 'get', 'get_d', 
   
   
 'get_r', 'getcwd', 'getfo', 'isdir', 'isfile', 'lexists', 'listdir', 'listdir_attr', 'logfile', 'lstat', 'makedirs', 'mkdir', 
   
   
'normalize', 'open', 'put', 'put_d', 'put_r', 'putfo', 'pwd', 'readlink', 'remote_server_key', 'remove', 'rename', 'rmdir', 
   
   
'security_options', 'sftp_client', 'stat', 'symlink', 'timeout', 'truncate', 'unlink', 'walktree'] 
  
  
Https://bitbucket.org/dundeemt/pysftp official link

Download https://pypi.python.org/pypi/pysftp/

Http://pysftp.readthedocs.io/en/release_0.2.9/ Documentation Center