gleam/erlang/os

Access to the shell’s environment variables

Types

Represents operating system kernels

pub type OsFamily {
  WindowsNt
  Linux
  Darwin
  FreeBsd
  Other(String)
}

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pub fn family() -> OsFamily

Returns the kernel of the host operating system.

Unknown kernels are reported as Other(String); e.g. Other("sunos").

family() Linux family() Darwin family() Other(“sunos”)

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pub fn get_all_env() -> Map(String, String)

Returns the list of all available environment variables as a list of key, tuples.

get_all_env() map.from_list([ #(“SHELL”, “/bin/bash”), #(“PWD”, “/home/j3rn”), … ])

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pub fn get_env(name name: String) -> Result(String, Nil)

Returns the value associated with the given environment variable name.

get_env(“SHELL”) “/bin/bash”

get_env(name: “PWD”) “/home/j3rn”

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pub fn set_env(name name: String, value value: String) -> Nil

Associates the given value with the given environment variable name.

set_env(“MYVAR”, “MYVALUE”) Nil get_env(“MYVAR”) “MYVALUE”

set_env(value: “MYVALUE”, name: “MYVAR”) Nil

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pub fn unset_env(name name: String) -> Nil

Removes the environment variable with the given name.

Returns Nil regardless of whether the variable ever existed.

get_env(“MYVAR”) Ok(“MYVALUE”) unset_env(“MYVAR”) Nil get_env(“MYVAR”) Error(Nil)

unset_env(name: “MYVAR”) Nil