regex - Bash - 使用可变 URL CD 进入 Untared 目录

Question

情况是这样的。我有一个需要提取和设置的 URL 列表。它都是变量驱动的，但在我提取后，我不知道我的文件夹将被称为什么。如果我不知道它叫什么，我就不能 CD 进去。

$DL_DIR = /opt/
$URL = http://nginx.org/download/nginx-1.3.3.tar.gz
$FILE=${URL##*/}
$CONFIG = "-- core"

cd "$DL_DIR"
wget $URL
tar xzf $FILE
cd <HOW DO I GO INTO IT?>
./configure "$CONFIG"
make
make install
rm $FILE

如果这不能解释，请说明。我真的很想解决这个问题，但我很难解释它。

因为我希望它适用于任何一组 URL，这些 URL 可能有两种格式，如“.tar.gz”或一种格式“.zip”，并且文件名中可能有 .'s，如“Python2.3.4”，或者可能不是“Nginx”，这让它有点棘手。

Answer 1

#! /bin/bash
   #
   # Problem: 
   #  find the path of the "root" folder in an archive
   #
   # Strategy: 
   #  list all folders in the archive.
   #  sort the list to make sure the shortest path is at the top.
   #  print the first line
   # 
   # Weak point:
   #  assumes that tar tf and unzip -l will list files in a certain way
   #  that is: paths ending with / and that the file-list of unzip -l 
   #  is in the fourth column.
   # 

   LIST_FILES=
   FILE=$1
   case ${FILE##*.} in
       gz)
       LIST_FILES="tar tf $FILE"
       ;;
       tgz)
       LIST_FILES="tar tf $FILE"
       ;;
       zip)
       LIST_FILES='unzip -l '$FILE' | awk "{print \$4}"'
       ;;
   esac
   ARCHIVE_ROOT=$(
   echo $LIST_FILES | sh |\
       grep '/$'|\
       sort |\
       head -n1
   )

   # we should have what we need by now, go ahead and extract the files.
   if [ -d "$ARCHIVE_ROOT" ]; then
       cd "$ARCHIVE_ROOT"
   else
       # there is no path (whoever made the archive is a jerk)
       # ...or the script failed (see weak points)
       exit 1
   fi