code example:
import subprocess
cmd_list = ["ls -la", "touch a.txt", "hostname"]
for _,i in enumerate(cmd_list):
x = subprocess.run(i)
print(x)
print(x.args)
print(x.returncode)
print(x.stdout)
print(x.stderr)
hostname works as expected but ls -la not
expected output:
output of ls -la, touch and hostname
error hitted:
File "linux_cmd.py", line 8, in <module>
x = subprocess.run(i)
File "/usr/lib64/python3.6/subprocess.py", line 423, in run
with Popen(*popenargs, **kwargs) as process:
File "/usr/lib64/python3.6/subprocess.py", line 729, in __init__
restore_signals, start_new_session)
File "/usr/lib64/python3.6/subprocess.py", line 1364, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'ls -la': 'ls -la'```
subprocess.run() expects the arguments as a list when you give more than one argument.
Change you cmd_list to a list of lists when you want to give multiple arguments:
cmd_list = [["ls", "-la"], ["touch", "a.txt"], "hostname"]
https://docs.python.org/3/library/subprocess.html#subprocess.run
Related
When trying to create a fabric2.Connection, Paramiko tries to invoke a local /bin/bash command:
$ fab2 db-shell
Traceback (most recent call last):
File "/nix/store/m2iyj18cifr4a1rvpfgphg7kfgsf2pj2-python3.9-fabric2-2.7.1/bin/.fab2-wrapped", line 9, in <module>
sys.exit(program.run())
File "/nix/store/20k85mfdkbrj5w1pq0d7dzagygfip70h-python3-3.9.13-env/lib/python3.9/site-packages/invoke/program.py", line 384, in run
self.execute()
File "/nix/store/20k85mfdkbrj5w1pq0d7dzagygfip70h-python3-3.9.13-env/lib/python3.9/site-packages/invoke/program.py", line 566, in execute
executor.execute(*self.tasks)
File "/nix/store/20k85mfdkbrj5w1pq0d7dzagygfip70h-python3-3.9.13-env/lib/python3.9/site-packages/invoke/executor.py", line 129, in execute
result = call.task(*args, **call.kwargs)
File "/nix/store/20k85mfdkbrj5w1pq0d7dzagygfip70h-python3-3.9.13-env/lib/python3.9/site-packages/invoke/tasks.py", line 127, in __call__
result = self.body(*args, **kwargs)
File "/home/username/project/fabfile.py", line 645, in db_shell
bastion_connection().run(
File "/home/username/project/fabfile_utils.py", line 141, in bastion_connection
conn = Connection(
File "/nix/store/20k85mfdkbrj5w1pq0d7dzagygfip70h-python3-3.9.13-env/lib/python3.9/site-packages/fabric2/connection.py", line 403, in __init__
self.ssh_config = self.config.base_ssh_config.lookup(host)
File "/nix/store/20k85mfdkbrj5w1pq0d7dzagygfip70h-python3-3.9.13-env/lib/python3.9/site-packages/paramiko/config.py", line 223, in lookup
options = self._lookup(hostname=hostname)
File "/nix/store/20k85mfdkbrj5w1pq0d7dzagygfip70h-python3-3.9.13-env/lib/python3.9/site-packages/paramiko/config.py", line 250, in _lookup
or self._does_match(
File "/nix/store/20k85mfdkbrj5w1pq0d7dzagygfip70h-python3-3.9.13-env/lib/python3.9/site-packages/paramiko/config.py", line 389, in _does_match
passed = invoke.run(exec_cmd, hide="stdout", warn=True).ok
File "/nix/store/20k85mfdkbrj5w1pq0d7dzagygfip70h-python3-3.9.13-env/lib/python3.9/site-packages/invoke/__init__.py", line 48, in run
return Context().run(command, **kwargs)
File "/nix/store/20k85mfdkbrj5w1pq0d7dzagygfip70h-python3-3.9.13-env/lib/python3.9/site-packages/invoke/context.py", line 95, in run
return self._run(runner, command, **kwargs)
File "/nix/store/20k85mfdkbrj5w1pq0d7dzagygfip70h-python3-3.9.13-env/lib/python3.9/site-packages/invoke/context.py", line 102, in _run
return runner.run(command, **kwargs)
File "/nix/store/20k85mfdkbrj5w1pq0d7dzagygfip70h-python3-3.9.13-env/lib/python3.9/site-packages/invoke/runners.py", line 380, in run
return self._run_body(command, **kwargs)
File "/nix/store/20k85mfdkbrj5w1pq0d7dzagygfip70h-python3-3.9.13-env/lib/python3.9/site-packages/invoke/runners.py", line 431, in _run_body
self.start(command, self.opts["shell"], self.env)
File "/nix/store/20k85mfdkbrj5w1pq0d7dzagygfip70h-python3-3.9.13-env/lib/python3.9/site-packages/invoke/runners.py", line 1291, in start
self.process = Popen(
File "/nix/store/0zzvjh5gnz0ny7ckilzyn9hmg5lypszf-python3-3.9.13/lib/python3.9/subprocess.py", line 951, in __init__
self._execute_child(args, executable, preexec_fn, close_fds,
File "/nix/store/0zzvjh5gnz0ny7ckilzyn9hmg5lypszf-python3-3.9.13/lib/python3.9/subprocess.py", line 1821, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: '/bin/bash'
I've not been able to find anything in the docs about this yet.
I'm running fabric2==2.7.1, invoke==1.6.0, and paramiko==2.8.0 on NixOS stable 22.11.
Invoke currently defaults to /bin/bash, which is a known issue, since operating systems like Alpine and NixOS don't have that path. Fortunately we can specify a command in $PATH rather than manually looking it up, so adding the following to the Connection call does the trick: config=invoke.Config(overrides={"shell": "bash"}).
I'm trying to run this code:
import subprocess
def install_curl():
result = subprocess.check_output(['command', '-v', 'dnf']) #
if not result:
print("You should Install curl")
else:
result = subprocess.check_output(['command', '-v', 'apt'])
print(result)
install_curl()
Then I'm getting this error:
Traceback (most recent call last):
File "/home/pbravodez1/projects/Automate_task/test_gpg.py", line 98, in <module>
install_curl()
File "/home/pbravodez1/projects/Automate_task/test_gpg.py", line 91, in install_curl
result = subprocess.check_output(['command', '-v', 'dnf']) #
File "/usr/lib/python3.8/subprocess.py", line 411, in check_output
return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
File "/usr/lib/python3.8/subprocess.py", line 489, in run
with Popen(*popenargs, **kwargs) as process:
File "/usr/lib/python3.8/subprocess.py", line 854, in __init__
self._execute_child(args, executable, preexec_fn, close_fds,
File "/usr/lib/python3.8/subprocess.py", line 1702, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'command'
Do you have any idea on how to run this "command" in order to check which package manager is installed in the Operating System?
I cannot use parameters when invoking date command inside Popen.
I am using Ubuntu 18.04.2 LTS, Python 3.6.7. I am trying to just print date by invokin date command from shell, unfortunately I got errors which says
Traceback (most recent call last):
File "./123.py", line 15, in <module>
print_date()
File "./123.py", line 9, in print_date
MyOut = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
File "/usr/lib/python3.6/subprocess.py", line 709, in __init__
restore_signals, start_new_session)
File "/usr/lib/python3.6/subprocess.py", line 1344, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: "date '+%S'": "date '+%S'"
Code:
#!/usr/bin/python3
import subprocess
import time
import os
cmd = "date '+%S'"
def print_date():
MyOut = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout,stderr = MyOut.communicate()
print(stdout)
print(stderr)
os.system(cmd)
print_date()
Could anyone explain what went wrong, and why Python tries to find file "date '+%S'" ?
It works when we change cmd to cmd = "date", so what is correct way of passing '+%S' ?
The normal way to pass a command to Popen() is with a list. Try this:
cmd = ["date" '+%S']
completeProcess = subprocess.run("la")
This is my code to run commands via python, and it raise this error:
Traceback (most recent call last):
File "script_senior.py", line 171, in <module>
completeProcess = subprocess.run("la") # doesn't capture output
File "/usr/lib/python3.5/subprocess.py", line 693, in run
with Popen(*popenargs, **kwargs) as process:
File "/usr/lib/python3.5/subprocess.py", line 947, in __init__
restore_signals, start_new_session)
File "/usr/lib/python3.5/subprocess.py", line 1551, in _execute_child
raise child_exception_type(errno_num, err_msg)
FileNotFoundError: [Errno 2] No such file or directory: 'la'
My OS is ubuntu, and when enter "la" in terminal, it will list files(include hidden files) in current working directory. and "ll" cmd will list file details. but I can't use them in python's subprocess api
How can I achieve this function? Is there any common api to run commands or just the python didn't recognize "la"
la is an alias for 'ls -A'. That comes as a default shell alias in systems like Ubuntu. If you wanna run it just use:
completeProcess = subprocess.run(["ls","-A"])
and if you are looking for the stdout you can use something like:
completeProcess = subprocess.run(["ls","-A"] , stdout=subprocess.PIPE)
print(completeProcess.stdout.decode())
I am trying to call a function using subprocess.Popen as:
proc = subprocess.Popen(["/usr/local/bin/qstat", "-u", "rudrab"],stdout=subprocess.PIPE)
numjobs = proc.stdout.read()
which is giving error:
Traceback (most recent call last):
File "genpos.py", line 159, in <module>
proc = subprocess.Popen(["/usr/local/bin/qstat", "-u", "rudrab"],stdout=subprocess.PIPE)
File "/opt/python-3.5/lib/python3.5/subprocess.py", line 950, in __init__
restore_signals, start_new_session)
File "/opt/python-3.5/lib/python3.5/subprocess.py", line 1544, in _execute_child
raise child_exception_type(errno_num, err_msg)
FileNotFoundError: [Errno 2] No such file or directory: '/usr/local/bin/qstat'
but qstat is in my path:
which qstat
/usr/local/bin/qstat
what I am doing wrong here?