
Cisco IOS [CLI Filtering show commands](/cli-filtering-show-commands) does not support "double piping".

For example, let's say you want to find all drops on your interfaces:

```
SW1#show interface | include Total output drops:      
  Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/375/0/1 (size/max/drops/flushes); Total output drops: 5435
  Input queue: 0/375/0/10 (size/max/drops/flushes); Total output drops: 998
  Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 787
  Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
  Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
```

It might be nice if you could do this:

```
SW1#sh int | include Total output drops | exclude 0
```

Unfortunately, this doesn't work.

Keep in mind you can use regular expressions. These are powerful and allow you to filter anything you need. For complex regular expressions, you can use these tools: [regular expressions testing](/regular-expressions-testing).

Here is a quick example:

```
SW1#sh int | include Total output drops: [1-9]     
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 8687
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 1436
  Input queue: 0/2000/0/9 (size/max/drops/flushes); Total output drops: 30
  Input queue: 0/2000/0/30 (size/max/drops/flushes); Total output drops: 76587
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 1046
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 27462
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 201
  Input queue: 0/2000/0/11 (size/max/drops/flushes); Total output drops: 2165
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 3654
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 160322
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 95379
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 3643
```

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