joshua.aug
I have a mix task that outputs results to file as follows:
defp write_to_file(contents) do
app_dir = File.cwd!()
new_file_path = Path.join([app_dir, "results.txt"])
File.write(
new_file_path,
contents,
[:write]
)
end
It seems like the file is missing. Are there special permissions that need to be set? It is running in ubuntu.
Is it supposed to error if it doesn’t have permissions?
Where Next?
Trending in Questions
Other Trending Topics
Latest on Elixir Forum
Sponsor Spotlight
Phoenix, LiveView, multimedia pipelines, distributed systems. 400 engineers, Elixir since 2017. Available for hire.
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #library
- #deployment
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #elixirconf
- #channels
- #exunit
- #discussion
- #code-sync
- #podcasts
- #javascript
- #onsite
- #dialyzer
- #docker
- #authentication
- #ai
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #blog-post
- #elixirconf-us
- #elixir-ls
- #phoenix_html
- #iex
- #graphql
- #genstage
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #processes
- #elixirconf-eu
- #api
- #forms
- #security
- #performance
Our Sponsors
Build Elixir applications with speed and confidence.
Supporting innovation across the BEAM ecosystem.
Catch errors, track performance, monitor hosts and more.
Error tracking, logs, uptime, and Just Enough APM. Built for developers.
Elixir, Erlang & BEAM conferences from Code Sync - join us in 2026!
Bringing learning, work and compliance together since 1987.
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!"
Showing Posts 1 to 3- Show Best Posts
- Show All (oldest first)
- Show All (newest first)
Hermanverschooten
Use
File.write!/3to get an exception,File.write/3returns an error tuple.Maybe check for the contents of
new_file_path.And unless you are doing this as a temporary thing, I would suggest not to write files in your application folder.
joshua.aug
I’m getting
{:error, :eacces}Yes I’m just trying to write logs. Could put it in a better folder. If the folder doesn’t exist does it create it automatically?
I’m using ubuntu. How to give correct permissions to the mix task?
krasenyp
I presume you try to write logs to a file you don’t have permissions for writing. My advice is to use Logger instead of reinventing the wheel. It can be configured to write to a file but you can see all the options by clicking the link.