Subprocess Types Table

Xonsh has a few different ways to launch subprocesses, each with their own unique interface depending on your need. The following table is a quick reference for the different suprocesses. The columns have the following meaning:

Type:

The syntax for an example subprocess cmd.

Output:

Whether the output is streamed to stdout/stderr. If “captured”, the output is not streamed as the cmd runs. If “uncaptured”, the output is streamed.

Returns:

The type of the object returned by the subprocess executions. For example, if you were to run p = $(cmd), the return column gives the type of p.

Notes:

Any comments about the subprocess.

Type

Output

Returns

Notes

cmd

Uncaptured

HiddenCommandPipeline

The same as ![cmd]

![cmd]

Uncaptured

HiddenCommandPipeline

$[cmd]

Uncaptured

None

!(cmd)

Captured

CommandPipeline

$(cmd)

Captured

str

stdout is returned