When piping the output of a Python program, the Python interpreter gets confused about encoding and sets it to None. This means a program like this: # -*- coding: utf-8 -*- print u”åäö” will work fine when run normally, but fail with: UnicodeEncodeError: ‘ascii’ codec can’t encode character u’\xa0′ in position 0: ordinal not in … Read more
How do I redirect stdout to an arbitrary file in Python? When a long-running Python script (e.g, web application) is started from within the ssh session and backgounded, and the ssh session is closed, the application will raise IOError and fail the moment it tries to write to stdout. I needed to find a way … Read more
How can I run a command-line application in the Windows command prompt and have the output both displayed and redirected to a file at the same time? If, for example, I were to run the command dir > test.txt, this would redirect output to a file called test.txt without displaying the results. How could I … Read more
Are there situations in which sys.stdout.write() is preferable to print? (Examples: better performance; code that makes more sense) 15 Answers 15 print is just a thin wrapper that formats the inputs (modifiable, but by default with a space between args and newline at the end) and calls the write function of a given object. By … Read more
I’m using Python’s logging module to log some debug strings to a file which works pretty well. Now in addition, I’d like to use this module to also print the strings out to stdout. How do I do this? In order to log my strings to a file I use following code: import logging import … Read more
Is output buffering enabled by default in Python’s interpreter for sys.stdout? If the answer is positive, what are all the ways to disable it? Suggestions so far: Use the -u command line switch Wrap sys.stdout in an object that flushes after every write Set PYTHONUNBUFFERED env var sys.stdout = os.fdopen(sys.stdout.fileno(), ‘w’, 0) Is there any … Read more
This question already has answers here: How to redirect and append both standard output and standard error to a file with Bash (9 answers) Closed 8 months ago. I want to redirect both standard output and standard error of a process to a single file. How do I do that in Bash? 15 s 15 … Read more
I have a program that writes information to stdout and stderr, and I need to process the stderr with grep, leaving stdout aside. Using a temporary file, one could do it in two steps: command > /dev/null 2> temp.file grep ‘something’ temp.file But how can this be achieved without temp files, using one command and … Read more
In bash, calling foo would display any output from that command on the stdout. Calling foo > output would redirect any output from that command to the file specified (in this case ‘output’). Is there a way to redirect output to a file and have it display on stdout? 1 11
To redirect standard output to a truncated file in Bash, I know to use: cmd > file.txt To redirect standard output in Bash, appending to a file, I know to use: cmd >> file.txt To redirect both standard output and standard error to a truncated file, I know to use: cmd &> file.txt How do … Read more
