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# Send notes for processing by other programs
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A great way to expand `zk` feature set is to explore a wealth of command-line tools available. You can use `zk`'s powerful [searching and filtering](note-filtering.md) capabilities to select notes before delegating further processing to other programs.
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## Process file paths
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Many programs expect file paths for input. You can interface with such program using the `path` list format and a space delimiter.
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```sh
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$ zk list --format path --delimiter " "
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```
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If the file paths can contain spaces, you may want to quote manually the paths, using the `{{path}}` [template variable](template-format.md) instead:
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```sh
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$ zk list --format "'{{path}}'" --delimiter " "
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```
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As always, this is such a useful [command alias](config-alias.md) to have:
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```toml
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paths = "zk list --format \"'{{path}}'\" --quiet --delimiter ' ' $@"
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```
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Some programs – such as `xargs` – work better when file paths are separated by the ASCII NUL character (`\0`). In this case, you can use the `--delimiter0` (or `-0`) option.
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For example, this command prints the full Git history of the notes:
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```sh
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$ zk list --format path --delimiter0 | xargs -0 git log --patch --
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```
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### Feeding `zk` to itself
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Some `zk` options such as `--exclude` also take file paths for parameters. Let's increase their flexibility by nesting `zk` calls. In this case, the delimiter will be `,`.
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For example, this command lists the notes which are linked by at least one other note – so the notes which are *not* orphans.
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```sh
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$ zk list --exclude "`zk list -q -f path -d "," --orphan`"
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```
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And this one finds the notes which are linked by at least one note in `journal/`.
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```sh
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$ zk list --linked-by "`zk list -q -f path -d "," journal`"
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```
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## Process the content of a note
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If you want to directly transform the content instead, you may use the `raw-content` template variable, which will print the full content of the note file.
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In this particular case, we usually want to process only one note at a time. You can make sure that `zk list` will print only the first note from the result with `--limit 1` (or `-n1`).
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```sh
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$ zk list --format {{raw-content}} --limit 1
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```
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