@j-o-r/sh
v1.0.6
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Execute shell commands on Linux-based systems from javascript
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@j-o-r/sh
Execute shell commands from JavaScript.
Introduction
@j-o-r/sh
is a Node.js module that simplifies the execution of shell commands within JavaScript applications. It provides a range of utilities to handle shell scripts and manage their output efficiently.
This project draws inspiration from the exceptional zx library. The core functionality of zx, particularly the shell execution method, has been extracted and forms the foundation of this project.
Installation
Install the module using npm:
npm install @j-o-r/sh
Usage
Basic Usage
To execute a shell command, use the SH
function:
import { SH, cd, within, sleep, retry, expBackoff } from '@j-o-r/sh';
SH`your_shell_command`.run()
.then(output => {
console.log('Output:', output);
})
.catch(error => {
console.error('Error:', error);
});
Advanced Usage
const res = await SH`ls -FLa | grep package.json | wc -l`.run();
console.log(res);
const ar = within(async () => {
const res = await Promise.all([
SH`sleep 1; echo 1`.run(),
SH`sleep 2; echo 2`.run(),
sleep(2),
SH`sleep 3; echo 3`.run()
]);
});
const p = await retry(3, expBackoff(), () => SH`curl -s https://unreachable`.run());
The SH
method accepts a template literal string enclosed in backticks as its argument. It returns an SHDispatch
object.
Additional Utilities
The module also provides additional utilities for common tasks:
parseArgs(process.args)
: Transform an array of strings into an objectcd(dir)
: Change the working directory.sleep(duration)
: Pause execution for a specified duration.retry(count, interval, callback)
: Retry a command a specified number of times with an optional interval.readIn()
: Read from standard input.within(callback)
: Create an async context in a sync block.expBackoff(max, rand)
: Generate intervals for exponential backoff.
SHDispatch
This class is returned by the SH
function. Here's a summary of its methods and properties:
Methods
- options(options): Sets options for the command execution.
- run(payload?): Executes the command and returns a promise that resolves with the command's output.
- runSync(payload?): Executes the command synchronously and returns a
SpawnSyncResponse
. - kill(): Sends a kill signal to the child process.
Examples
Elementary usages, piped:
const res = await SH`ls -FLa | grep package.json | wc -l`.run(); console.log(res);
Feed command with content:
const res = await SH`wc -l`.run(`one\ntwo\n`); console.log(res);
Create a command from a string
const command = "uname -r"; const content = await SH`${command}`.run(); console.log(content);
Async context with multiple commands and sleep:
within(async () => { const res = await Promise.all([ SH`sleep 1; echo 1`.run(), SH`sleep 2; echo 2`.run(), sleep(2), SH`sleep 3; echo 3`.run() ]); console.log(res); });
Retry with exponential backoff:
try { const p = await retry(3, expBackoff(), () => SH`curl -s https://flipwrsi`.run()); } catch (e) { console.error('Retry failed:', e); }
Method for copying data to the clipboard:
/** * Copy text to the clipboard * @param {string} text * @retruns {Promise<string>} */ const copyToClipboard = async (text) => { const prams = [ '-selection', 'clipboard' ] return SH`xclip ${prams}`.options({stdio: 'inherit'}).run(text); }
Open the 'vim' editor
SH`vim`.options({stdio: 'inherit'}).runSync();
License
This project is licensed under the Apache License, Version 2.0.