Skip wrong password for 7z extraction Ubuntu

Question

The task is to extract files from multiple password-protected archives stored in “IN” directory with 7zip package, passwords stored in list “PASS”. I have a problem: when the password is wrong 7zip creates empty folders and files. Are there any ways to skip wrong password and go to next iteration? Here’s my bash script

FILES=./IN/*
PASS=(‘1’ ‘2’ ‘3’)
for f in $FILES
do
 for psd in $(PASS[@])
  do
   if 7z x -y -p”$psd” -o./OUT $f | grep ‘ERROR’; then
    break
   fi
  done
done

Answer 1

Here's a suggestion : use 7zz t (test archive integrity) to determine if a given password in your list is valid before attempting extraction.

Example:

#! /bin/sh
                                                                                                                                                                                               
WORKDIR='path/to/your/work/dir'

PW='1 2 3'

for File in "$WORKDIR"/*.zip
do  test -r "$File"   ||   continue
    for Password in $PW
    do  7zz t -p"$Password" "$File" >/dev/null 2>&1 \
        &&   { 7zz x -p"$Password" "$File";   break; }
    done   ||   echo "warning: could not extract file \"$File\" (no valid password found)"
done

Note:

• if you've installed package "7zip", the archiver command name is 7zz.

• if you've installed package "p7zip-full" (the Unix CLI port of 7-Zip), the archiver command name is 7z.

---

Tested on Linux Debian 11.

Hope that helps.