Run script with variables from package.json?

Question

I work on a Node.js project and often run a command in bash which looks like this:

path/to/file/1 --flags path/to/file/2 --flags somecommand

The command is mostly the same, I only change path/to/file/2 all the time. Now I would like to implement a script into my package.json file so I can run something like this:

npm run scriptcommand path/to/file/2

I don't know much about bash but I feel like I would need something like this in my package.json file:

{
  "scripts": {
    "scriptcommand": "path/to/file/1 --flags $1 --flags somecommand"
  }
}

Is there any posibility to substitute path/to/file/2 with a variable like in the above example so I can set a different path on every run?

FoundNil · Accepted Answer · 2018-06-13 03:34:55Z

1

Make a new file to hold your script

scriptcommand.sh

#!/usr/bin/env bash
path/to/file/1 --flags $1 --flags somecommand

probably need to chmod it

sudo chmod +x scriptcommand.sh

package.json

{
  "scripts": {
    "scriptcommand": "scriptcommand.sh"
  }
}

And then to run it use

npm run scriptcommand -- "path/to/file/2"

Notice the -- this tells npm to pass along any remaining arguments to your script.

answered Jun 13, 2018 at 3:34

FoundNil

4115 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

dgeorgiev · Accepted Answer · 2018-01-26 14:15:18Z

1

You can try the following:

"scripts": {
    "scriptcommand": "/bin/echo --flags $FLAGS --flags somecommand"},

FLAGS="path/to/file/2" npm run scriptcommand

Essentially, you set an environment variable, which you use in your scripts command.

edited Jan 26, 2018 at 14:15

answered Jan 26, 2018 at 13:47

dgeorgiev

9417 silver badges23 bronze badges

1 Comment

dgeorgiev Over a year ago

Strange. What OS/bash versions do you use? And can you paste the exact command you are trying to call? You could also try: FLAGS="path/to/file/2"; npm run scriptcommand (with ';') Note that this however will leave the variable set for subsequent commands, unless you unset/change its value.

Collectives™ on Stack Overflow

Run script with variables from package.json?

2 Answers 2

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related