To convert from a timestamp of the form mm:ss to seconds using Zsh, you can use the following steps:

1. Split the timestamp into minutes and seconds using the `cut` command.
2. Multiply the minutes by 60 to convert them to seconds.
3. Add the minutes and seconds together to get the total number of seconds.

Here is a Zsh function that you can use to convert a timestamp of the form mm:ss to seconds:

```
function timestamp_to_seconds() {
  local timestamp=$1
  local minutes=$(cut -d':' -f1 <<< "$timestamp")
  local seconds=$(cut -d':' -f2 <<< "$timestamp")
  local total_seconds=$((minutes * 60 + seconds))
  echo "$total_seconds"
}
```

To use the function, simply pass the timestamp that you want to convert to seconds as the argument. For example, to convert the timestamp `01:30` to seconds, you would use the following command:

```
timestamp_to_seconds 01:30
```

This would output the following result:

```
90
```

You can also use the function in a pipeline. For example, to convert the timestamp `01:30` to seconds and then print the result to the console, you would use the following command:

```
timestamp_to_seconds 01:30 | print
```

This would output the following result:

```
90
```
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