extract

#!/bin/bash

if [ $# -lt 1 ]; then
  echo "Usage: $(basename $0) FILES"
  exit 1
fi

extract() {
  arg="$1"
  cd "$(dirname "$arg")" || exit
  case "$arg" in
  *.tar.bz2)
    tar xjf "$arg" --one-top-level
    local code=$?
    ;;
  *.tar.gz)
    tar xzf "$arg" --one-top-level
    local code=$?
    ;;
  *.bz2)
    bunzip2 "$arg"
    local code=$?
    ;;
  *.gz)
    gunzip "$arg"
    local code=$?
    ;;
  *.tar)
    tar xf "$arg" --one-top-level
    local code=$?
    ;;
  *.tbz2)
    (tar xjf "$arg" --one-top-level)
    local code=$?
    ;;
  *.tgz)
    tar xzf "$arg" --one-top-level
    local code=$?
    ;;
  *.zip)
    a_dir=$(expr "$arg" : '\(.*\).zip')
    7z x "$arg" -o"$a_dir"
    local code=$?
    ;;
  *.7z)
    a_dir=$(expr "$arg" : '\(.*\).7z')
    7z x "$arg" -o"$a_dir"
    local code=$?
    ;;
  *.Z)
    uncompress "$arg"
    local code=$?
    ;;
  *.rar)
    a_dir=$(expr "$arg" : '\(.*\).rar')
    mkdir "$a_dir"
    7z x "$arg" -o"$a_dir"
    local code=$?
    ;;
  *)
    echo "'$arg' cannot be extracted via extract()" 1>&2
    exit 1
    ;;
  esac
  cd - || exit $?
  exit $code
}

extract "$1"