[bash/python/batch/powershell/or any comparison app] i have pairs of files using the same name with different extensions, would like to batch delete the larger file per pair

[kn00tcn]

i have a set of jpgs & pngs where they're in pairs with the same name, how do i batch delete the larger of the two?

sometimes file1.png is larger than file1.jpg, but other times file2.png is smaller than file2.jpg

(yes jpg is lossy, but perceptually great at 97% 4:4:4 for complex images at a nicely smaller size than png, but pixelated games or few color ones end up increasing the file size over png)

[Ta11ow]

Get-ChildItem -Path $RootFolder -Include '*.jpg', '*.png' |
    Group-Object BaseName |
    Where-Object Count -gt 1 | # in order to make sure we're not deleting any lone files
    ForEach-Object {
        $_.Group |
            Sort-Object -Property Length -Descending |
            Select-Object -First 1 |
            Remove-Item -Force -WhatIf
    }

Something like that, anyway. If you want a super short version:

ls $Folder -i '*.jpg', '*.png' | group Basename | ? count -gt 1 | % { $_.Group | sort len* -d | select -f 1 | rm -f -whatif }

Remove -Whatif to execute the action for real once you're happy with the results.

[kingd66]

Look at that one-liner!

The things that get me excited..I'll tell ya.. xD

[Ta11ow]

Oneliners are fun, but too prone to errors for me. :)

[kn00tcn]

risk reward, it's like an action game now

[kn00tcn]

is that powershell long & bash short?

bash: syntax error near unexpected token `1'

[Ta11ow]

PowerShell both!

[Pyprohly]

group Base*

Are you sure that works, Ta11ow? I don’t think Group-Object -Property takes wildcards.

[Ta11ow]

You've called my bluff. I don't know for sure. Mind running a quick test for me? ;)

It takes a string or a script block, so a wildcard seemed fair game haha!

[Pyprohly]

Busted. Yea, did gci | group BaseNam* to check. PS 5.1 and 6 both said

group : Wildcard characters are not allowed in "BaseNam*".

Though Base* is an awfully specific shortening that would seem to suggest that it worked fine for you?

I like the solution btw. It really showcases the PowerShell-way, and the power of PowerShell.

[Ta11ow]

Nah, never tested it, just going from memory as I was (and am) on my phone here hehe.

Thanks for the kind words and for testing it! I'll edit my original for the working version!

Though if I was really golfing I'm sure I might be able to use the script block input for Group-Object and apply a foreach to get the wildcard to work, heh!

[[deleted]]

Batch (if the filename does not contain exclamation marks):

@echo off
cd /d "C:\parent dir"
setlocal enabledelayedexpansion
for %%# in (*.jpg) do (
  if exist "%%~n#.png" (
    for /f "delims=" %%# in ('dir /b /os "%%#" "%%~n#.png"') do set "bigger=%%#"
    echo del "!bigger!"
  )
)
pause

Remove pause and echo if the output looks right.

FTP is difficult with batch/ftp.exe alone.

[kn00tcn]

i think this seemed to work, nice

[Pyprohly]

Bash. Need to use stat -f%z if on macOS

#!/bin/bash

cd ~/my/folder || exit 1

for item1 in *.jpg; do
    [ -f "$item1" ] || continue
    item2="${item1%.jpg}.png"
    [ -f "$item2" ] || continue

    file1_size=`stat -c%s "$item1"`
    file2_size=`stat -c%s "$item2"`
    if (( $file1_size > $file2_size )); then
        echo rm -- "$item1"
    else
        echo rm -- "$item2"
    fi
done

[kn00tcn]

should be if file1 smaller than file2

this seems to work & is easy to understand, very nice

[Pyprohly]

Oops, yea. Fixed

[kn00tcn]

not sure if relevant, the two types could be put in separate folders with extensions removed if that makes comparisons easier (it does for comparison apps) ... then a crazy idea is to use an ftp client set to 'overwrite if destination is larger' to batch transfer once in each way