os

module methods:

stdin

open File pointing to the standard input file descriptor.

(os stdin) -> file

stdout

open File pointing to the standard output file descriptor.

(os stdout) -> file

stderr

open File pointing to the standard error file descriptor.

(os stderr) -> file

platform

it is runtime.GOOS in Golang.

(os platform) -> string

arch

it is runtime.GOARCH in Golang.

(os arch) -> string

exit

exit causes the current program to exit with the given status code. Conventionally, code zero indicates success, non-zero an error. The program terminates immediately, finally sub-expression in try will not execute.

(os exit code(int)) -> nil

get_env

Return the value of the environment variable named by the key. It returns the value, which will be empty if the variable is not present.

(os get_env key(string)) -> string

get_env_ex

Return a 2-element list value of the environment variable named by the key and bool value which indicate whether the key exists. 

(os get_env_ex key(string)) -> [string,bool]

set_env

Sets the value of the environment variable named by the key. It returns an error, if any.

(os set_env key(string) val(string)) -> nil

unset_env

Unsets a single environment variable. It returns an error, if any.

(os unset_env key(string)) -> nil

clear_env

Deletes all environment variables.

(os clear_env) -> nil

environ

Returns a dict of strings representing the environment.

(os environ) -> dict

user_home_dir

Returns the current user's home directory. It returns an error, if any.

(os user_home_dir) -> string

user_config_dir

Returns the default root directory to use for user-specific configuration data. Users should create their own application-specific subdirectory within this one and use that. It returns an error, if any.

(os user_config_dir) -> string

user_cache_dir

Returns the default root directory to use for user-specific cached data. Users should create their own application-specific subdirectory within this one and use that. It returns an error, if any.

(os user_cache_dir) -> string

hostname

Returns the host name reported by the kernel. It returns an error, if any.

(os hostname) -> string

uid

Returns the numeric user id of the caller.

(os uid) -> int

gid

Returns the numeric group id of the caller.

(os gid) -> int

euid

Returns the numeric effective user id of the caller.

(os euid) -> int

egid

Returns the numeric effective group id of the caller.

(os egid) -> int

groups

Returns a list of the numeric ids of groups that the caller belongs to. It returns an error, if any.

(os groups) -> [int...]

start_process

Starts a new process with the program, arguments and attributes specified by name, args.

(os start_process name(string) args(any)...) -> process

find_process

Looks for a running process by its pid.

(os find_process pid(int)) -> process