Questions tagged [streams]

In computer networking, STREAMS is the native framework in Unix System V for implementing character devices.

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42 views

Piping curl http://cheat.sh/python to less is showing strange ESC[38;5;246m [duplicate]

I am kinda new to Linux. My base issue: I need to show the output of curl cheat.sh/python like a man or less page, so that I can easily scroll up and down. What have I tried: curl cheat.sh/python | ...
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1answer
30 views

tar (child): : Cannot open: Is a directory

I know thats a pretty dumb question but I didn't found this precise question on internet I try to tar -cvjf all the contents of a directory (/*) and directly redirect that to a file (> file) but ...
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1answer
205 views

Is there any control character or hack to prevent simple command line tools from showing subsequent data?

I'ld like to hide ugly data from being shown by command line tools like cat (and maybe simple text editors too) which often get confused by binary data. For example a VT100 terminal sometimes gets ...
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0answers
25 views

Proper (working) way to return an int pointer through STREAMS?

I had been doing some work with an old SVR4 box with serial i/o when I found that the driver for the serial card did not support TIOCMGET through an ioctl call (e.g. ioctl(fd, TIOCMGET, &arg);). ...
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1answer
121 views

Time and again I forget the meaning of a single hyphen in the end of some utility commands [duplicate]

Time and again I come across old codes and recognize a single hyphen in the command's end: mysqldump -u root -p --all-databases | zip "$drt/db-$date.zip" - or wget ${target_url} -O - | tar -xzv --...
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2answers
202 views

What are two caveats of line buffering in Unix?

A paragraph from APUE Chapter 5.4 about line buffer: Line buffered. In this case, the standard I/O library performs I/O when a newline character is encountered on input or output. This allows us ...
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2answers
1k views

Reading partially downloaded gzip with an offset

Let's say that there is one huge db.sql.gz of size 100GB available https://example.com/db/backups/db.sql.gz and the server supports range requests. So instead of downloading the entire file, I ...
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1answer
1k views

Ffmpeg - youtube-dl

I have try to use ffmpeg to download youtube media in mp3. ffmpeg -i <url> -f mp3 output.mp3 It's working with other urls, but not with youtube-dl retrived youtube video urls. Ffmpeg returns ...
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2answers
241 views

How to pass multiple files in one stream to process them pipe-like (without saving) on the receiving side?

I need to determine the filetype on an indeterminate number of base64-encoded filestreams coming from stdin (image files base64-encoded and cat'ed). A single file would simply be ... | base64 -d | ...
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1answer
27 views

Stream raminication with continuation if one branch breaks

Say I ramify a video stream to 2 ffplay processes cat video.mp4 | tee >(ffplay -i -) >(ffplay -i -) > /dev/null Now, if I kill one of the ffplay process, the stream is stopped which is not ...
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3answers
289 views

Redirect nohup-heredoc stdout to stdin, to execute directly?

I aim to paste this heredoc script and execute so to install and timeout-uninstall PHPmyadmin after 2 hours, from security reasons. nohup bash -s -- $$ <<'EOF0' & #!/bin/bash -x apt-get ...
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2answers
317 views

Why were STREAMS marked obsolescent in POSIX.1-2008? [closed]

The POSIX.1-2008 XRAT rationale states that X/Open STREAMS may be removed from future versions of the standard, and that strictly conforming applications shouldn't use them, but it doesn't explain why....
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1answer
962 views

piping text file to telnet over ssh

I would like to pipe a text file with commands to a telnet session I have open on a ssh client, Is this possible? an example: I have a text file cmds that contains commands like FirstFunction(A,B,C,...
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1answer
122 views

How to store endless stream to file?

Let's have any stream of binary data (like /dev/random, /dev/zero, etc.). Let's have a file which size can be N at maximum. Let's the N is in order of gigabytes. Is there any elegant method/...
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3answers
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How do pipes and infinite streams work?

I usually use command1 | command2 | command3 a lot in Linux but most of them are dealing with definite content. When I tried this with an infinite stream cat | sed '' | sed '' which hopefully ...
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1answer
689 views

Watch not showing subshell output

Why does the following not output "hello" line? watch bash -c 'echo hello' As this one? watch 'echo hello' I expected to have echo write to bash output directly and this to be read by watch and ...
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3answers
12k views

How can I set up a “USB proxy” for /dev/ttyUSB0 over the network?

I have a device under test (DUT) and I measure its power usage the using a Power Analyzer Datalogger using the data from /dev/ttyUSB0. The problem is that the DUT is now remotely from the workstation ...
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4answers
9k views

How to use sed to manipulate continuously streaming output?

I am putting together a presentation for a non-technical audience. I have a program running in bash that outputs a continuous stream of values, a few of which are important. I would like to highlight ...
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2answers
1k views

Remove data from the STDIN stream buffer of another TTY session

I encountered a problem the other day while running multiple tty sessions in separate terminal windows. I was running a expensive disk access command and was waiting for it to return. Meanwhile I was ...
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2answers
6k views

How I/O channels are implemented in Linux kernel?

stdin, stdout, stderr are some integers that index into a data structure which 'knows' which I/O channels are to be used for the process. I understand this data structure is unique to every process. ...
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1answer
2k views

How can I install STREAMS in Linux?

I searched on Google, but found nothing useful. I use SUSE now, how can I install LiS on my computer? I'm hoping for a download link.