lua脚本读入文本文件以及删除第一行文本

local filePath =  "D:\\1.txt"
function readFile(file)
    assert (file, "file open failed" )
    local fileTab = {}
    local line = file:read()
    while  line  do
        print( "get line" ,line)
        table.insert(fileTab,line)
        line = file:read()
    end
    return  fileTab
end

function writeFile(file,fileTab)
    assert (file, "file open failed" )
    for  i,line in ipairs(fileTab)  do
        print( "write " ,line)
        file:write(line)
        file:write( "\n" )
    end
end

function main()
    print( "start" )
    local fileRead = io.open(filePath)
    if  fileRead then
        local tab = readFile(fileRead)
        fileRead:close()
        table. remove (tab,1)
        local fileWrite = io.open(filePath, "w" )
        if  fileWrite then
            writeFile(fileWrite,tab)
            fileWrite:close()
        end
    end
end

main()