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What Does tee Command Do in Linux? The tee command reads standard input (stdin) and writes it to both standard output (stdout) and one or more files. tee is usually part of a pipeline, and any number of commands can precede or follow it.
The tee command, used with a pipe, reads standard input, then writes the output of a program to standard output and simultaneously copies it into the specified file or files. Use the tee command to view your output immediately and at the same time, store it for future use.
tee command reads the standard input and writes it to both the standard output and one or more files. The command is named after the T-splitter used in plumbing. It basically breaks the output of a program so that it can be both displayed and saved in a file.
What is the tee command in UNIX? The tee command in UNIX is a command line utility for copying standard input to standard output. It supports writing whatever it is given from standard input to standard output and optional writing to one or more files. The command is named after T splitter used in plumbing.
From man python:
-u Force stdin, stdout and stderr to be totally unbuffered. On systems
where it matters, also put stdin, stdout and stderr in binary mode. Note
that there is internal buffering in xreadlines(), readlines() and file-
object iterators ("for line in sys.stdin") which is not influenced by
this option. To work around this, you will want to use "sys.stdin.read‐
line()" inside a "while 1:" loop.
So what you can do is:
/usr/bin/python -u client.py >> logfile 2>&1
Or using tee:
python -u client.py | tee logfile
Instead of making it fully unbuffered you can make it linebuffered as it is normally with sys.stdout.reconfigure(line_buffering=True) (after import sys of course).
This was added in 3.7, docs: https://docs.python.org/3/library/io.html#io.TextIOWrapper.reconfigure
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