> For the complete documentation index, see [llms.txt](https://huataihuang.gitbook.io/cloud-atlas-draft/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://huataihuang.gitbook.io/cloud-atlas-draft/develop/shell/sed_awk/awk_shell_var.md).

# awk和shell之间的变量传递

```bash
down=50
up=$down+20
cat $i.log | awk 'BEGIN {count = 0} {if ($1 >= $down && $1 < $up) count = count + 1 fi} END {print $down","$up","count}' >> ${i}_result.csv
```

结果发现打印出来`$down`和`$up`实际是空的，实际上就是shell中的变量`$down`和`$up`并没有传递给awk。

参考了[shell & awk 变量传递](http://jimobit.blog.163.com/blog/static/283257782009101735619534/)，使用了比较土的方法

> `export变量，然后用 ENVIRON["var"]`

```
        ((down=50+$j*20))
        export down
        ((up=$down+20))
        export up
        cat $i.log | awk 'BEGIN {count = 0} {if ($1 >= ENVIRON["down"] && $1 < ENVIRON["up"]) count = count + 1 fi} END {print count}' >> ${i}_result.csv
```


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