Lua を AWK 的に使う支援バッチ：（例）luawk "printf('%03d %s\n',NR,S[0])" ファイル名

luawk.cmd

::rem:: --[[ vim:set ft=lua: 
@lua "%~f0" %* & exit /b 0
]]--

-- requires Lua 5.3

if #arg < 1 then
    print( string.format( [[Usage: %s "SCRIPT" files...
    S[n]        = $n on AWK
    NR          = NR on AWK
    FNR         = FNR on AWK
    FILENAME    = FILENAME on AWK
    printf(...) = io.write(string.format(...))]] , arg[0]) )
    os.exit(1)
end

local function split(line)
    local S = {}
    for p in string.gmatch(line,"%S+") do
        S[#S+1] = p
    end
    S[0] = line
    return S
end

function printf(...)
    io.write(string.format(...))
end

local onelinear = assert( load(arg[1] ) )

NR = 0
if #arg >= 2 then
    for i=2,#arg do
        FNR = 0
        FILENAME = arg[i]
        for line in io.lines(FILENAME) do
            NR = NR + 1
            FNR = FNR + 1
            S = split(line)
            onelinear()
        end
    end
else
    FNR = 0
    FILENAME=""
    for line in io.lines() do
        NR = NR + 1
        FNR = FNR + 1
        S = split(line)
        onelinear()
    end
end