Questions tagged [stdio]
The stdio tag has no usage guidance.
11
questions
0
votes
0
answers
19
views
*nix shell: How to disable pipe buffering for ALL pipes in a command?
I want every pipe to be unbuffered, so I don't have to type stdbuf -oL for every piped command. When concocting commands with multiple pipes, it would be nice if there was a environment variable or ...
- 101
0
votes
2
answers
55
views
Unexpected expect/ssh question
I am seeking to automate ssh password based logins (and a series of actions after logging in).
I am aware that the ssh password prompt bypasses STDIN. To that end I put together a quick expect script.
...
- 4,295
2
votes
1
answer
218
views
Additional file descriptor for debugging and piped output (logging, metrics, etc)
For a bash script project, I write human-readable log info to stdout/stderr. Additionally, I want to write formatted metrics to a third stream that will be discarded by default but can be redirected ...
- 23
2
votes
1
answer
100
views
Did fwrite/fread(3) offer different "multiple items" behavior on different platforms historically?
The fread(3) and fwrite(3) have an extra parameter for a variable number of items. So a typical write often has a hardcoded count when all it has is a char buffer to begin with e.g. fwrite(data, len, ...
- 184
1
vote
2
answers
60
views
How to read server stdout and continue only after message is outputted
Say I have a simple Node.js server like:
const http = require('http');
const server = http.createServer((req,res) => res.end('foobar'))
server.listen(3000, () => {
console.log(JSON....
user393961
1
vote
2
answers
621
views
Appending both stdout and stderr to file
I have this:
nohup_ntrs(){
nohup_file="$HOME/teros/nohup/stdio.log"
mkdir -p "$(dirname "$nohup_file")";
echo " ------------- BEGIN $(date) -------------- " >> "$nohup_file"
nohup "$@" &...
- 8,308
0
votes
0
answers
36
views
How to determine if a process is part of a pipeline (producer in pipeline)? [duplicate]
So if I am in my terminal and run:
$ my_proc | grep foo
in my_prof I know it's part of a pipeline because stdout is not attached to the terminal but to grep. On the other hand, if I just run this:
$...
user356473
1
vote
1
answer
71
views
Writing and Executing Program to behave like console
I have written a set of programs with the intent of using a radio transmitter-receiver (NRF24L01) to connect two devices as if they were connected via a serial interface.
Currently, i am able to ...
- 13
4
votes
1
answer
72
views
Determine if producer is outpacing consumer in pipeline
If I have:
node foo.js | node bar.js
is there a way to determine if there is a queue in between them that's building up?
in other words if the producer is outpacing the consumer w.r.t. stdio?
- 8,308
6
votes
3
answers
7k
views
Behaviour of the backspace on terminal
This is about the behaviour of the backspace (\b) character.
I have the following C program:
int main() {
printf("Hello\b\b");
sleep(5);
printf("h\n");
return 0;
}
The output on my ...
- 193
7
votes
3
answers
4k
views
Communicate backwards in a pipe
I have a simple pipeline:
node foo.js | node bar.js
bar.js will read from stdin to get data from foo.js.
But what I want to do is ensure that bar.js gets one of the last messages from foo.js before ...
- 8,308