axelson
How can I send a process a message from a shell script?
Is there a straightforward way to send a message to my Elixir process from a bash script?
To avoid the XY problem, I am trying to implement a pianobar eventcmd, which is a script that is run on each event (such as song change) and receives the majority of it’s input via stdin. Should I use a pipe? I could do an HTTP Request but that seems awfully inefficient.
First Post!
mwgkgk
Most Liked
ConnorRigby
I can think of solving this a number of ways. Do you have distribution available? If not i would use a domain socket if you are on a Linux or OSx machine. (i think OSX supports unix domain sockets)
From an iex session:
{:ok, sock} = :gen_udp.open(0, [{:ifaddr, {:local, '/tmp/testsockin'}}])
and from a shell
echo 'Hello, World!' | socat - UNIX-SENDTO:/tmp/testsockin
peerreynders
ConnorRigby
Last Post!
lkuty
I found that useful to send messages from system cron. Note the use of a backslash in front of %. I have a GenServer called CronServer in charge of parsing the message and calling the appropriate client function in the interested GenServers. I also use sched_ex for cron jobs internal to the app.
5 7 * * * ID=xxx_cron echo "minute. datetime: $(date +'\%FT\%T\%:z')" | socat - UNIX-SENDTO:/tmp/elixir_xxx_cron
Popular in Questions
Other popular topics
Latest on Elixir Forum
Sponsor Spotlight
Catch errors, track performance, monitor hosts and more.
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #deployment
- #library
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #channels
- #elixirconf
- #exunit
- #discussion
- #code-sync
- #javascript
- #podcasts
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #elixir-ls
- #phoenix_html
- #iex
- #blog-post
- #graphql
- #genstage
- #ai
- #websockets
- #supervisor
- #elixirconf-us
- #advent-of-code
- #distillery
- #processes
- #api
- #forms
- #metaprogramming
- #security
- #hex
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Error tracking, logs, uptime, and Just Enough APM. Built for developers.
Develop your skills with books, videos, and courses.
Producing high quality Elixir screencasts since 2017.
The deployment platform built for Elixir: PaaS ease, VPS control.
The team behind Membrane, Popcorn, LiveDebugger. Available for hire.
Courses that'll move you from confusion to "Aha, now I get it!"