코드보관소/lua
[lua] file
위치결정
2021. 7. 13. 16:11
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--file open
-- r : Read only
-- w : overwrite or create a new file
-- a : Append or create a new file
-- r+ : Read & Write existing file
-- w+ : Overwrite read or create a file
-- a+ : Append read or create file
file = assert(io.open("test.txt", "w"))
file:write("Hello World")
file:close()
-- http://lua-users.org/wiki/FileInputOutput
-- see if the file exists
function file_exists(file)
local f = io.open(file, "rb")
if f then f:close() end
return f ~= nil
end
-- get all lines from a file, returns an empty
-- list/table if the file does not exist
function lines_from(file)
if not file_exists(file) then return {} end
lines = {}
for line in io.lines(file) do
lines[#lines + 1] = line
end
return lines
end
-- tests the functions above
local file = 'test.lua'
local lines = lines_from(file)
-- print all line numbers and their contents
for k,v in pairs(lines) do
print('line[' .. k .. ']', v)
end
https://stackoverflow.com/questions/6889589/create-a-new-file-in-lua-luafilesystem
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