#### 4.4.12 Through

Syntax: `Through [`command`]`
Abbreviation: `T`

asks the shell to execute command, piping the current block in the standard input, and replacing it with the output of the command. This command is most useful with filters, such as `sort`. Its practical effect is to pass the block through the specified filter.

Note that by selecting an empty block (or equivalently by having the mark unset) you can use `Through` to insert the output of any un*x command in your file.

If the optional argument command is not specified, you can enter it on the input line.