This question already has answers here:
How do I execute a program or call a system command?
(65 answers)
Closed 5 years ago.
There are mainly two questions that I would like to ask, thanks in advance.
(1) How can I open an external program in Linux?
I know in Windows there is a command os.startfile() to open another program, the equivalent for Ubuntu is open(), but there's no response after I run the code, and the alternative one is subprocess.call(). This works well in Windows, but in Ubuntu it fails, could someone provide a standard templete I can use for? (Similarly like to double click the icon of a program)
(2) How can I realize functions like the code is able to open the terminal and write down several commands in terminal automatically using python?
os.system can do this work. for example, you want to run 'ls' under a shell. want_run='ls';os.system('bash -c '+ want_run);
(1)
You can use proc = subprocess.Popen(command, stdout=subprocess.PIPE) and afterwards run proc.stdout.read() to get the output of the command run.
See the subprocess documentation https://docs.python.org/2/library/subprocess.html
(2)
Please provide more info on this question(examples) for what you want to do.
Related
I am currently running a python3 script in Ubuntu server 18.04. When i type new commands into the command line it just prints the commands. My terminal window looks like this:
mitch#server:`$ cd /home/mitch/folder
mitch#server:`/folder$ python3 main.py
file running ...
text i input just shows like this
I need to keep the script running and run other commands, how do i navigate back to:
mitch#server:`
I'm new to servers/Ubuntu/commands so this may seem trivial! Thank you
So you can't "navigate" back to that, since you're technically already there, you're just running a script in your shell which is occupying your shell - think of it like you opened a program in full screen.
But you have a few options:
The most basic is to run the script in the 'background' this is a simple as adding a & to the end of your command (note that it will still send any message from the script into your terminal - if your script is programmed to send messages that is).
Another option is to use a terminal multiplex like which lets you have multiple terminals open, as well as split screen terminals and many other features. One of the more popular multiplexers is called tmux, just keep in mind that it does have a bit of a learning curve to it, but is extremely useful once you learn it.
I have a python script that takes some inputs from the user & then executes the code based on the input. The code takes some time to complete; during this code runtime the user can close the terminal(the code is run from a Linux machine)
As soon as the user closes the terminal the script stops as well. I know there are options like nohup but it wouldn't accept any input(where input is required in my script).
How can I fix this?
Requirement is -
Run the script, enter the inputs
Let the code run in the background even if the terminal is closed
Also is there a way to write whatever is being printed in the terminal(during the script runtime) to some file
Linux's screen tmux served my purpose.
There is a work around possible,
you can split your programm into two parts.
And start your background task with:
import os
usr_inp=input("test input: ")
os.popen(f"python3 background_task.py {usr_inp} &")
This should start the other programm in the background, there you can use the input over the sys.argv[1] variable.
(Usually it's not recommended using os.popen)
This question already has answers here:
How do I execute a program or call a system command?
(65 answers)
Closed 4 years ago.
I found myself doing a repetitive task and wondered how I can automate it.
I can write a function script with python(3), to iterate through each item in a folder, but I'm not sure how I would run that through command prompt.
I have sort of looked into how it would be possible, but I think a direct response to my exact question would be more helpful and easier to grasp.
My question comes more from a desire to learn than it does from laziness!
You could use os.system, but subprocess.run is probably better. You should also use glob:
import glob
import subprocess
files = glob.glob('*.wav')
for file in files:
subprocess.run(['xWMAEncode', file, file.replace('.wav', '.xwm')])
Using the Turtle shell scripting library I am trying to launch a program, i.e:
shell "vim" empty
The problem is that this yields the warning Warning: Input is not from a terminal and causes Vim to lag for a few seconds before finally launching.
Questions:
Is shell the best Turtle function to launch an external program from haskell?
If so, is there any way to get around errors like the above?
You want to use functions from the process library, specifically createProcess or runProcess.
Relevant turtle thread on the issue here.
Example usage.
You could try manually setting up I/O to the vty. E.g. in bash: vim < $TTY > $TTY. I guess turtle is doing that with its own file descriptors under the hood, based on the warning, so you should be able to manually set up those redirects (or just use the command I gave via shell). You just need to make sure you've got a TTY environment var around.
Excuse me for the imprecisions in the question but I don't know how it is called what I'm trying.
In the CodeShip documentation is stated that I can pass to the SSH CodeShip debug build some commands using their command line application.
So, I should do something like cs setup-commands and I'm prompted with this:
rof#railsonfire_unique_string_sfivbe8bwucb9:~$ cs setup-commands
Your setup commands:
phpenv local 5.6
phpenv local 5.6
In Your setup commands: I put my commands but then, how can I "execute" them?
The second phpenv local 5.6 line is wrote by the command-line application. I think is something to signal the command were taken, but the behavior is ever the same: I remain "blocked" in the command setup-commands. After setting setup-commands I have to set also test-commands but all the things I write are taken by Your setup commands:.
How can I "submit and exit" the command setup-commands to then launch test-commands and set those other commands?
I think this is something related to Bash, but I don't know what it is...
And I don't know which is the correct terminology.
Can someone help me with this? So I will can also update my question to be more precise. Thank you.
Not sure about your case, but usually the input is considered finished, when th input file (in your case stdin) is closed.
Try to press Ctrl+D, it should end your input (and so signal the program hat you stopped typing for this session)