Edit
for i in *.bkscr ; do mv -v "$i" "${i%.bkscr}.txt" done
find *.txt -exec sh -c "iconv -f GB18030 -t UTF-8 {} > {}t" \;
for i in *.txtt ; do mv -v "$i" "${i%.txtt}.txt" done
tar -zcvf xxxx.tar.gz directory
tar -zxvf xxxx.tar.gz