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---Lua os standard library
---Documentation for the Lua os standard library.
---From Lua 5.1 Reference Manual <https://www.lua.org/manual/5.1/>
---by Roberto Ierusalimschy, Luiz Henrique de Figueiredo, Waldemar Celes.
---Copyright © 2006-2012 Lua.org, PUC-Rio.
---Freely available under the terms of the Lua license <https://www.lua.org/license.html>.
---@class os
os = {}
---Returns an approximation of the amount in seconds of CPU time
---used by the program.
function os.clock() end
---Returns a string or a table containing date and time,
---formatted according to the given string format.
---If the time argument is present,
---this is the time to be formatted
---(see the os.time function for a description of this value).
---Otherwise, date formats the current time.
---If format starts with '!',
---then the date is formatted in Coordinated Universal Time.
---After this optional character,
---if format is the string "*t",
---then date returns a table with the following fields:
---year (four digits), month (1--12), day (1--31),
---hour (0--23), min (0--59), sec (0--61),
---wday (weekday, Sunday is 1),
---yday (day of the year),
---and isdst (daylight saving flag, a boolean).
---If format is not "*t",
---then date returns the date as a string,
---formatted according to the same rules as the C function strftime.
---When called without arguments,
---date returns a reasonable date and time representation that depends on
---the host system and on the current locale
---(that is, os.date() is equivalent to os.date("%c")).
---@param format ? #
---@param time ? #
function os.date(format, time) end
---Returns the number of seconds from time t1 to time t2.
---In POSIX, Windows, and some other systems,
---this value is exactly t2-t1.
---@param t2 #
---@param t1 #
function os.difftime(t2, t1) end
---This function is equivalent to the C function system.
---It passes command to be executed by an operating system shell.
---It returns a status code, which is system-dependent.
---If command is absent, then it returns nonzero if a shell is available
---and zero otherwise.
---@param command ? #
function os.execute(command) end
---Calls the C function exit,
---with an optional code,
---to terminate the host program.
---The default value for code is the success code.
---Calling os.exit will do a hard exit which will not run
---the engine shutdown code. This may cause crashes on exit.
---The recommended way to terminate your game is by using
---the exit message which does a graceful shutdown.
---msg.post("@system:", "exit", {code = 0})
---@param code ? #
function os.exit(code) end
---Returns the value of the process environment variable varname,
---or nil if the variable is not defined.
---@param varname #
function os.getenv(varname) end
---Deletes the file or directory with the given name.
---Directories must be empty to be removed.
---If this function fails, it returns nil,
---plus a string describing the error.
---@param filename #
function os.remove(filename) end
---Renames file or directory named oldname to newname.
---If this function fails, it returns nil,
---plus a string describing the error.
---@param oldname #
---@param newname #
function os.rename(oldname, newname) end
---Sets the current locale of the program.
---locale is a string specifying a locale;
---category is an optional string describing which category to change:
---"all", "collate", "ctype",
---"monetary", "numeric", or "time";
---the default category is "all".
---The function returns the name of the new locale,
---or nil if the request cannot be honored.
---If locale is the empty string,
---the current locale is set to an implementation-defined native locale.
---If locale is the string "C",
---the current locale is set to the standard C locale.
---When called with nil as the first argument,
---this function only returns the name of the current locale
---for the given category.
---@param locale #
---@param category ? #
function os.setlocale(locale, category) end
---Returns the current time when called without arguments,
---or a time representing the date and time specified by the given table.
---This table must have fields year, month, and day,
---and may have fields hour, min, sec, and isdst
---(for a description of these fields, see the os.date function).
---The returned value is a number, whose meaning depends on your system.
---In POSIX, Windows, and some other systems, this number counts the number
---of seconds since some given start time (the "epoch").
---In other systems, the meaning is not specified,
---and the number returned by time can be used only as an argument to
---date and difftime.
---@param table ? #
function os.time(table) end
---Returns a string with a file name that can
---be used for a temporary file.
---The file must be explicitly opened before its use
---and explicitly removed when no longer needed.
---On some systems (POSIX),
---this function also creates a file with that name,
---to avoid security risks.
---(Someone else might create the file with wrong permissions
---in the time between getting the name and creating the file.)
---You still have to open the file to use it
---and to remove it (even if you do not use it).
---When possible,
---you may prefer to use io.tmpfile,
---which automatically removes the file when the program ends.
function os.tmpname() end
return os
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