Questions tagged [async]
18 questions
175
votes
7 answers
Can I watch the progress of a `sync` operation?
I've copied a large file to a USB disk mounted on a Linux system with async. This returns to a command prompt relatively quickly, but when I type sync, of course, it all has to go to disk, and that takes a long time.
I understand that it's going to…
mattdm
- 39,535
- 18
- 99
- 133
12
votes
1 answer
Save cursor position and restore it in terminal
I am playing with some terminal capabilities to create async prompt output on bash. I want to get something like this: while outputting string in PROMPT_COMMAND, save terminal cursor position, print put ... and go do other stuff (printing other info…
Lapshin Dmitry
- 323
- 2
- 13
4
votes
1 answer
How to set interval for an asynchronous command in bash?
I'm trying to achieve this
while condition; do
var=value1
### update value every 5s
while sleep 5; do
var=value2
done
###
...
[ rest of code ]
done
The problem here is that the script will always enter the loop and block the rest of the code
Belka h.j
- 55
- 4
4
votes
1 answer
To sync or not to sync in an embedded environment?
I have a single board appliance that runs Debian 10 on a chunk of flash. UBIFS is used, and is split into two volumes: an ro roots, and an rw /var. I have found that under power cycling/reset conditions, that I can end up with 0 byte files. I keep…
Travis Griggs
- 1,461
- 3
- 14
- 21
4
votes
1 answer
Populate PS1 asynchronously
I have a few git svn related functions that see if I have to pull/push from/to the repository.
My problem is that the functions I've written to gather this information are too slow. I'd like to make them async so that PS1 shows a default, if though…
Alberto Zaccagni
- 385
- 2
- 9
3
votes
2 answers
How to attach a listener to sysfs files?
How to watch for sysfs file changes (like /sys/class/net/eth0/statistics/operstate) and execute a command on content change?
inotify does not work on sysfs
I don't want to poll. I want to set a listener with a callback routine once
Zeta.Investigator
- 880
- 1
- 7
- 25
3
votes
2 answers
Stopping an asynchronous while loop in a shell script
I have a asynchronous while loop that restarts processes until some condition is met. This look something like this:
(while [ "$check_condition" -eq 1 ]; do
./async_command
done) &
... # do some stuff
check_condition=0
pkill -9…
N. Krh
- 33
- 6
3
votes
1 answer
Why does io_uring have a layer of indirection for the submission queue?
From the paper on io_uring, the submission ring contains indices into a submission array, where the submission event itself is stored. The documentation explains this layer of indirection as follows:
One important difference is that while the CQ…
perpetual_check
- 171
- 4
3
votes
1 answer
Messages on new terminal after using nohup
I'm trying to run a few commands asynchronously on a login script (.bash_profile).
When I open a new terminal, I see messages like this. They also show up when I log onto a system over SSH.
Last login: Sat Jun 11 19:21:44 on ttys001
[1]- Exit 127 …
user56041
2
votes
1 answer
What does "asynchronous" mean in these cases?
I have asked what "asynchronous" means a while ago for interrupts. Now I have the same question but for running shell commands and for cancelling threads.
From Bash manual
If a command is terminated by the control operator &, the shell executes the…
Tim
- 98,580
- 191
- 570
- 977
2
votes
1 answer
Set a callback for when a certain process is spawned
The script I'm writing launches process A, which after an uncertain amount of time, launches a child process B.
I need the script to execute a command C which depends on process B. But B might not be there at call time!
How to wait until a process…
deprecated
- 2,841
- 4
- 24
- 22
1
vote
1 answer
Curl returning with no response and does not wait for `wait=x seconds`
I call an async service that takes ~80 seconds to respond. I run:
curl -v -X POST https://hostname.com/service/v2/predict \
-H 'x-api-key: somekey' \
-H 'x-request-id: longfiles' \
-H "Authorization: Bearer dfv651df8fdvd" \
-H 'Prefer:…
Franck Dernoncourt
- 4,749
- 15
- 48
- 79
1
vote
1 answer
Enabling Asynchronous IO at HP-UX Operating System
We are using HP-UX Itanium version B.11.31 and this server is used for running Sybase database version ASE15.7. I would like to know how to enable Asynchronous IO at Operating System level.
I went through Sybase ASE and their suggestion is provided…
Learning_DBAdmin
- 159
- 6
1
vote
2 answers
run script asynchronously / in a different process
I have a simple php script
Itay Moav -Malimovka
- 111
- 5
0
votes
1 answer
Asynchronous downloading from virtual machine?
I have some files stored on a virtual machine that I'm downloading onto my PC. There are approximately 1 million files and I have been using the following command:
scp vm_user@IP:/home/vm_user/path_to_files /Users/documents
As you can imagine,…
dollar bill
- 111
- 3