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Executing a basic shell command in Elixir


Executing a basic shell command in Elixir

By : Juan Garay
Date : November 14 2020, 04:48 PM
This might help you System.cmd/3 seems to accept the arguments to the command as a list and is not happy when you try to sneak in arguments in the command name. For example System.cmd("ls", ["-al"]) works, while System.cmd("ls -al", []) does not. So in your case you'll probably need something like:
code :
System.cmd("play", ["-qn", "synth", "2", "pluck", note])
"ls -al" |> String.to_char_list |> :os.cmd


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Executing shell command from ruby using the same shell process

Executing shell command from ruby using the same shell process


By : anjani kumari
Date : March 29 2020, 07:55 AM
may help you . IO.popen
With IO.popen you can spawn a new process and use its stdin and stdout. The "r+" in this example is the access mode which is here read and write. Both echos will be interpreted by the same bash and will therefore yield the same process id.
code :
IO.popen("/bin/sh", "r+") do |p|
    p.puts("echo $$")
    puts p.readline
    p.puts("echo $$")
    puts p.readline
    p.puts("exit")
end
Execute Shell Command Synchronously with Elixir/Erlang

Execute Shell Command Synchronously with Elixir/Erlang


By : Eduardo
Date : March 29 2020, 07:55 AM
wish helps you os:cmd
Very basic IEx and IEx.pry from an elixir script gets error: IEx shell running?

Very basic IEx and IEx.pry from an elixir script gets error: IEx shell running?


By : R. K.
Date : March 29 2020, 07:55 AM
like below fixes the issue You are getting this error because an IEx needs to be running. Using the command iex reduce.exs will allow you to enter into the code and where IEx.pry is placed in your source file.
To continue execution from there type respawn in the shell. It will ask you if you want to allow the pry for every recursion, but eventually will print out the result of the test.
Using xvfb-run shell command in Elixir

Using xvfb-run shell command in Elixir


By : Ava Turner
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I want to use a node script that uses a xvfb (virtual X server). I have this command: , There was a problem with ". I have changed the argument
code :
"--server-args=\"-screen 0 1366x768x24\""
"--server-args=-screen\ 0\ 1366x768x24"
Elixir shell command with wildcard failing when using System.cmd

Elixir shell command with wildcard failing when using System.cmd


By : Ed G
Date : March 29 2020, 07:55 AM
With these it helps Wildcards like * are expanded by the shell, not by rm. Your command will only delete the file literally called /path/to/dir/-frames-*.png.
You can make the wildcard expand by passing the command to a shell like sh:
code :
System.cmd("/bin/sh", ["-c", "rm /path/to/dir/#{uuid}-frames-*.png"])
:os.cmd('rm /path/to/dir/#{uuid}-frames-*.png')
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