###文件批量重命名 

- 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
```



### The auto-run script in bash shell:

- on Mac: ~/.profile



### 批量中文编码转换 GB18030 到UTF-8
```
find *.txt -exec sh -c "iconv -f GB18030 -t UTF-8 {} > {}t" \;
```

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


### gzip

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


### Crontab 定时运行脚本
- https://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/