[防火墙](%E9%98%B2%E7%81%AB%E5%A2%99.md) [环境变量](linux/%E7%8E%AF%E5%A2%83%E5%8F%98%E9%87%8F.md) [shell](linux/shell.md) [crontab 定时任务](linux/crontab.md) [数据归档与解压缩](linux/%E6%95%B0%E6%8D%AE%E5%BD%92%E6%A1%A3%E4%B8%8E%E8%A7%A3%E5%8E%8B%E7%BC%A9.md) [图像处理](linux/%E5%9B%BE%E5%83%8F%E5%A4%84%E7%90%86.md) [文档表格处理](linux/%E6%96%87%E6%A1%A3%E8%A1%A8%E6%A0%BC%E5%A4%84%E7%90%86.md) [常用命令](linux/%E5%B8%B8%E7%94%A8%E5%91%BD%E4%BB%A4.md)