Create a child process.
If any stdio options are not set to "piped", accessing the corresponding
field on the Command or its CommandOutput will throw a TypeError.
If stdin is set to "piped", the stdin WritableStream
needs to be closed manually.
Command acts as a builder. Each call to Command.spawn or
Command.output will spawn a new subprocess.
Examples
Spawn a subprocess and pipe the output to a file
Spawn a subprocess and pipe the output to a file
const command = new Deno.Command(Deno.execPath(), {
args: [
"eval",
"console.log('Hello World')",
],
stdin: "piped",
stdout: "piped",
});
const child = command.spawn();
// open a file and pipe the subprocess output to it.
child.stdout.pipeTo(
Deno.openSync("output", { write: true, create: true }).writable,
);
// manually close stdin
child.stdin.close();
const status = await child.status;
Spawn a subprocess and collect its output
Spawn a subprocess and collect its output
const command = new Deno.Command(Deno.execPath(), {
args: [
"eval",
"console.log('hello'); console.error('world')",
],
});
const { code, stdout, stderr } = await command.output();
console.assert(code === 0);
console.assert("hello\n" === new TextDecoder().decode(stdout));
console.assert("world\n" === new TextDecoder().decode(stderr));
Spawn a subprocess and collect its output synchronously
Spawn a subprocess and collect its output synchronously
const command = new Deno.Command(Deno.execPath(), {
args: [
"eval",
"console.log('hello'); console.error('world')",
],
});
const { code, stdout, stderr } = command.outputSync();
console.assert(code === 0);
console.assert("hello\n" === new TextDecoder().decode(stdout));
console.assert("world\n" === new TextDecoder().decode(stderr));
Constructors
Methods
Executes the Deno.Command, waiting for it to finish and
collecting all of its output.
Will throw an error if stdin: "piped" is set.
If options stdout or stderr are not set to "piped", accessing the
corresponding field on Deno.CommandOutput will throw a TypeError.
Synchronously executes the Deno.Command, waiting for it to
finish and collecting all of its output.
Will throw an error if stdin: "piped" is set.
If options stdout or stderr are not set to "piped", accessing the
corresponding field on Deno.CommandOutput will throw a TypeError.