• 例如把后缀名从 bkscr 改成 txt。注意：如果文件名中有space，则一定要加双引号

for i in *.bkscr ; do
mv -v "$i" "${i%.bkscr}.txt"
done

• on Mac: ~/.profile

find *.txt -exec sh -c "iconv -f GB18030 -t UTF-8 {} > {}t" \;

for i in *.txtt ; do
mv -v "$i" "${i%.txtt}.txt"
done

• 圧縮 tar -zcvf xxxx.tar.gz directory
• 解凍 tar -zxvf xxxx.tar.gz

- https://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/