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Shx

shx is a wrapper around ShellJS Unix commands, providing an easy solution for simple Unix-like, cross-platform commands in npm package scripts.

shx is proudly tested on every node release since v6!

Difference Between ShellJS and shx

ShellJS: Good for writing long scripts, all in JS, running via NodeJS (e.g. node myScript.js).
shx: Good for writing one-off commands in npm package scripts (e.g. "clean": "shx rm -rf out/").

Install

npm install shx --save-dev

This will allow using shx in your package.json scripts.

Usage

Command Line

If you'd like to use shx on the command line, install it globally with the -g flag. The following code can be run either a Unix or Windows command line:

$ shx pwd                       # ShellJS commands are supported automatically
/home/username/path/to/dir

$ shx ls                        # files are outputted one per line
file.txt
file2.txt

$ shx rm *.txt                  # a cross-platform way to delete files!

$ shx ls

$ shx echo "Hi there!"
Hi there!

$ shx touch helloworld.txt

$ shx cp helloworld.txt foobar.txt

$ shx mkdir sub

$ shx ls
foobar.txt
helloworld.txt
sub

$ shx rm -r sub                 # options work as well

$ shx --silent ls fakeFileName  # silence error output

All commands internally call the ShellJS corresponding function, guaranteeing cross-platform compatibility.

package.json

ShellJS is good for writing long scripts. If you want to write bash-like, platform-independent scripts, we recommend you go with that.

However, shx is ideal for one-liners inside package.json:

{
  "scripts": {
    "clean": "shx rm -rf \"build/**/*.js\" \"build/output\" && shx echo \"Done cleaning\""
  }
}

It's safe to use && and || operators in npm package scripts. These will be interpreted by the operating system's shell (sh on Unix, cmd.exe on Windows). If you're using glob operators like * or **, then we recommend to put these in double quotes, which ensures that shx will expand the glob rather than the operating system shell.

[!IMPORTANT] Windows treats single quotes (ex. 'some string') differently than double quotes. We recommend wrapping your arguments in escaped double quotes so that your code is compatible cross platform (ex. "clean": "shx echo \"some string\"").

Command reference

Shx exposes most ShellJS commands. If a command is not listed here, assume it's supported!

sed

Shx provides unix-like syntax on top of shell.sed(). So ShellJS code like:

shell.sed('-i', /original string/g, 'replacement', 'filename.txt');

would turn into the following Shx command:

shx sed -i "s/original string/replacement/g" filename.txt

Note: like unix sed, shx sed treats / as a special character, and this must be escaped (as \/ in the shell, or \\/ in package.json) if you intend to use this character in either the regex or replacement string. Do not escape / characters in the file path.

Unsupported Commands

As mentioned above, most ShellJS commands are supported in shx. Due to the differences in execution environments between ShellJS and shx (JS vs CLI) the following commands are not supported:

Unsupported command	Recommend workaround
`shx cd`	Just use plain old `cd` (it's the same on windows too)
`shx pushd`	Just use plain old `pushd`. Use forward slashes and double-quote the path. (e.g. `pushd "../docs"`. This would fail on Windows without the quotes)
`shx popd`	Just use plain old `popd`
`shx dirs`	No workaround
`shx set`	See below
`shx exit`	Just use plain old `exit`
`shx exec`	Instead of `shx exec cmd`, just use plain old `cmd`
`shx ShellString`	No workaround (but why would you want this?)

Shx options

Shx allows you to modify its behavior by passing arguments. Here's a list of supported options:

`set` flag	`shell.config` setting	shx command	Effect
`-e`	`config.fatal = true`	Not supported	Exit upon first error
`-v`	`config.verbose = true`	`shx --verbose cd foo`	Log the command as it's run
`-f`	`config.noglob = true`	`shx --noglob cat '*.txt'`	Don't expand wildcards
N/A	`config.silent = true`	`shx --silent cd noexist`	Don't show error output

Team


Nate Fischer	Ari Porad	Levi Thomason