Go script to strip files matching a suffix from a ZIP file. I used this to strip .mp3 voicemails from my Google Voice takeout data dump, for example. "go run stripzip.go -file username@gmail.com-20140108T184123Z-Voice.zip -exclude .mp3"

zipstrip.go

package main

import (
        "archive/zip"
        "flag"
        "io"
        "log"
        "os"
        "strings"
)

var file = flag.String("file", "", "ZIP file to strip")
var exclude = flag.String("exclude", "", "File extension to remove")

func main() {
        flag.Parse()

        r, err := zip.OpenReader(*file)
        if err != nil {
                log.Fatal("open:", err)
        }

        outfile, err := os.Create(*file + "-stripped.zip")
        if err != nil {
                log.Fatal("create:", err)
        }
        defer outfile.Close()

        out := zip.NewWriter(outfile)
        defer out.Close()

        for _, f := range r.File {
                n := f.FileHeader.Name
                if strings.HasSuffix(n, *exclude) {
                        continue
                }

                w, err := out.CreateHeader(&f.FileHeader)
                if err != nil {
                        log.Fatal("create %s: %v", n, err)
                }
                r, err := f.Open()
                if err != nil {
                        log.Fatal("open %s: %v", n, err)
                }
                defer r.Close()
                if _, err := io.Copy(w, r); err != nil {
                        log.Fatal("copy %s: %v", n, err)
                }
        }
}