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.
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
Command()
Methods
output(): Promise<CommandOutput>
Executes the Deno.Command, waiting for it to finish and
collecting all of its output.
If spawn() was called, calling this function will collect the remaining
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.
outputSync(): CommandOutput
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.