# 个数统计

比如一个文件：

{% code title="original\_file" %}

```bash
a
b
a
c
d
e
a
e
d
a
b
c
a
```

{% endcode %}

每行一个字母，要统计每个字母出现的次数。可以：

```bash
awk '{sum[$0]+=1} END {for(k in sum) print k ":" sum[k]}' original_file
```

结果：

```bash
a:5
b:2
c:2
d:2
e:2
```

当然也可以放进一个脚本中：

{% code title="group\_by.awk" %}

```bash
#! /usr/bin/awk -f
{sum[$0]+=1} END {for(k in sum) print k ":" sum[k]}
```

{% endcode %}


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