extract

#!/bin/bash

# Extract common archive formats safely.
# Multi-file archives are extracted into a dedicated subdirectory (named after
# the archive) to avoid clobbering the current directory and to contain any
# malicious "../" paths. Single-file compressors keep the original file.
# Usage: extract <file> [file2 ...]

if [ $# -eq 0 ]; then
  echo "Usage: extract <file> [file2 ...]"
  exit 1
fi

for file in "$@"; do
  if [ ! -f "$file" ]; then
    echo "Error: '$file' is not a valid file."
    continue
  fi

  echo "Extracting '$file'..."

  # Destination dir for multi-file archives: archive name minus its extension(s).
  base=$(basename -- "$file")
  case "$base" in
    *.tar.bz2|*.tar.gz|*.tar.xz|*.tar.zst) dest="${base%.tar.*}" ;;
    *) dest="${base%.*}" ;;
  esac

  case "$file" in
    *.tar.bz2)  mkdir -p -- "$dest" && tar xjf        "$file" -C "$dest" ;;
    *.tar.gz)   mkdir -p -- "$dest" && tar xzf        "$file" -C "$dest" ;;
    *.tar.xz)   mkdir -p -- "$dest" && tar xJf        "$file" -C "$dest" ;;
    *.tar.zst)  mkdir -p -- "$dest" && tar --zstd -xf "$file" -C "$dest" ;;
    *.tar)      mkdir -p -- "$dest" && tar xf         "$file" -C "$dest" ;;
    *.tbz2)     mkdir -p -- "$dest" && tar xjf        "$file" -C "$dest" ;;
    *.tgz)      mkdir -p -- "$dest" && tar xzf        "$file" -C "$dest" ;;
    *.zip)      mkdir -p -- "$dest" && unzip -q       "$file" -d "$dest" ;;
    *.7z)       mkdir -p -- "$dest" && 7z x -o"$dest" "$file" ;;
    *.rar)      mkdir -p -- "$dest" && unrar x        "$file" "$dest"/ ;;
    *.bz2)      bunzip2 -k "$file" ;;
    *.gz)       gunzip  -k "$file" ;;
    *.xz)       unxz    -k "$file" ;;
    *.zst)      unzstd  -k "$file" ;;
    *.Z)        gunzip  -k "$file" ;;
    *)
      echo "Error: Unsupported format for '$file'."
      continue
      ;;
  esac
  rc=$?

  if [ "$rc" -eq 0 ]; then
    echo "Done: '$file'"
  else
    echo "Failed: '$file'"
  fi
done