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Questions tagged [tee]

46 questions
121
votes
5 answers

Preserve colors while piping to tee

ls -l --color=auto | tee output.log Without pipe/tee it's colored. How can I make it so that it stays colored while using tee (can be colored only on the screen, I don't care about colors in logs).
Paweł Gościcki
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105
votes
10 answers

What is the purpose of 'tee'?

All the usages of tee I ever saw were such: do_something | tee -a logfile Or: do_something_else | tee logfile Is tee invented for those that don't know you can do the same with shell pipe redirections? Such as: do_something >>…
R Moog
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58
votes
9 answers

Alternative to the tee command without STDOUT

I'm using | sudo tee FILENAME to be able to write or append to a file for which superuser permissions are required quite often. Although I understand why it is helpful in some situation, that tee also sends its input to STDOUT again, I never ever…
aef
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12
votes
1 answer

PowerShell and Tee

I use this command to see output both in the console and a file: powershell -command "my_command_1 | tee ('logs\{0}.log' -f (Get-Date -format 'yyyy.MM.dd-HH.mm'))" powershell -command "my_command_2 | tee ('logs\{0}.log' -f (Get-Date -format…
race1
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10
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2 answers

tee: What exactly does "--ignore-interrupts" option do?

The title basically says it all. tee has an option --ignore-interrupts: -i, --ignore-interrupts ignore interrupt signals Can anyone explain/give an example in which situation this is important? Thanks!
alexander.biskop
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9
votes
3 answers

Use netcat as a proxy to log traffic

I want to use netcat as a proxy to log http requests and responses to files, then tail these to inspect traffic. Think wireshark. Tried the following where 'fifo' is a named pipe, 'in' and 'out' are files, netcat proxy on port 8080, server on port…
deephacks
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8
votes
1 answer

Tee a script to file within itself

I'm familiar with using tee, and I know that I can simply log output with script.sh | tee file.log However, I want a seamless interface for the user. Is there a way to, within script.sh, run tee as if it was being done as above? Within this script…
Brydon Gibson
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6
votes
2 answers

Can you prefix each line written with tee with the current date and time?

I am using the 'tee' command in order to capture the results of a long bash command to a file. Can the file I emit with tee somehow prefix each line with the timestamp of when the line was written? I'm looking for a solution in which each line would…
user2917346
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5
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1 answer

How to print and pipe log file at the same time?

I use this to check the log lines of a log file until the occurrence of a specific event (taken from this answer to Monitoring a file until a string is found): (tail -f -n 0 test.log &) | grep -q 'SPEFICIC LOG MESSAGE' This works, but I also want…
not2savvy
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4
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6 answers

How can I both pipe and display output in Windows' command line?

I have a process I need to run within a batch file. This process produces some output. I need to both display this output to the screen and send (pipe) it to another program. The bash method uses tee: echo 'ee' | tee /dev/tty | foo Is there an…
Bob
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4
votes
1 answer

How to tee to stderr? (multiple sinks in one pipeline)

some_source | (tee /dev/stderr | sink_1) 2>&1 | sink_2 Seems to fail. How to do it right without of any temporaries?
Vi.
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4
votes
1 answer

Can I calculate the checksum of a file as I create it?

I am creating a large tar archive and I would like to create the checksum of the archive too. I could achieve it like this: $ tar cfz archive.tar.gz files $ sha256sum archive.tar.gz > archive.tar.gz.sha256sum But the archive file is huge and on…
jl6
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3
votes
1 answer

Linux: redirecting stdout and stderr

I want to write stdout to a file but also prints stdout and stderr. I tried using tee: prog | tee stdout.txt but this causes the printed stderr and stdout to be interleaved incorrectly, i.e. if the correct output should be OUT1 ERR1 OUT2 ERR2 OUT3…
Lie Ryan
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3
votes
2 answers

Let Tee Handle Carriage-Returns Better

I've written a Java-console application that repeatedly prints its status to the console using carriage-returns (\r) at the end rather than line-feeds (\n) to keep the output on one screen. I also want to pipe that output to a file, like java -jar…
sjngm
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2
votes
2 answers

tee causing bash scripts to hang

I have a script that calls a number of other install scripts ./script1.sh 2>&1 | tee script1.log
./script2.sh 2>&1 | tee script2.log
./script3.sh 2>&1 | tee script3.log
They all look ok till the last one which does a call to a custom…
Terry
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