shell：case
ftype=`file “$1″` # Note ‘ and ` is different case “$ftype” in“$1: Zip archive”*)
unzip “$1″ ;;
“$1: gzip compressed”*)
gunzip “$1″ ;;
“$1: bzip2 compressed”*)
bunzip2 “$1″ ;;
*) echo “File $1 can not be uncompressed with smartzip”;;
esac
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