Bash Shell脚本提取存档

Question

I am trying to convert the following script which I use to create archives into one which extracts them.

[[ $# -lt 2 ]] && exit 1

name=$1; shift
files=("$@")

#exclude all files/directories that are not readable
for index in "${!files[@]}"; do
   [[ -r ${files[index]} ]] || unset "files[index]"
done

[[ ${#files[@]} -eq 0 ]] && exit 1    

if tar -czvf "${name:-def_$$}.tar.gz" "${files[@]}"; then
   echo "Ok"
else
   echo "Error"
   exit 1
fi

So far I have this:

[[ $# -lt 1 ]] && exit 1

files=("$@")

#remove files and directories which are not readable
for index in "${!files[@]}"; do
        [[ -r ${files[index]} ]] || unset "files[index]"
done

[[ ${#files[@]} -eq 0 ]] && exit 1

if tar -xzvf "${files[@]}".tar.gz; then
        echo "OK"
else
        echo "Error"
        exit 1
fi

I dont know whether I needed to keep the shift as for this script I do not need to discard any arguments. I want to be able to take them all and unzip each one. Also I see there is a -C switch which allows the user to choose where the unzipped files go. How would I go about also adding this as an option for the user because they may or may not want to change the directory where the files get unzipped to.

Answer 1

You unfortunately can't just do tar -xzvf one.tar.gz two.tar.gz . Straightforward approach is to use a good old for loop:

for file in "${files[@]}"; do
   tar -xzvf "$file"
done

Or you can use this:

cat "${files[@]}" | tar -xzvf - -i

---

You can have the first argument to be the specified directory for the -C option:

[[ $# -lt 2 ]] && exit 1

target=$1; shift
files=("$@")

#remove files and directories which are not readable
for index in "${!files[@]}"; do
   [[ -r ${files[index]} ]] || unset "files[index]"
done

[[ ${#files[@]} -eq 0 ]] && exit 1

mkdir -p -- "$target" || exit 1

for file in "${files[@]}"; do
   tar -xzvf "$file" -C "$target"
done

./script /some/path one.tar.gz two.tar.gz

---

List of files for tar can be also constructed like this:

target=$1; shift

for file; do
   [[ -r $file ]] && files+=("$file")
done