CODEWITHSUNDEEP
node.jslinuxmacosechopackage.json
Oh Xyz
Oh Xyz

Reputation: 75

Create a npm command to create a file with content but without new line at the end

I'm trying to use echo -n command to write some content to a file without a new line in node's package.json e.g

start: "echo -n hello > my.file"

When I run npm start, instead of hello without a new line, it creates -n hello in my.file. However it runs correctly in my Terminal(I'm on Mac).

Upvotes: 2

Views: 2764

Answers (2)

Delapouite
Delapouite

Reputation: 10157

Depending of your context, you can use printf instead of echo, which does not append a \n char automatically.

https://unix.stackexchange.com/questions/58310/difference-between-printf-and-echo-in-bash

Upvotes: 1

tobias
tobias

Reputation: 1004

This is due to NPM running scripts with the sh(1) shell, which does not accept the -n option. One way of solving this would be to set NPM to use Bash:

npm config set script-shell "/bin/bash"

Documentation for echo command

Some shells may provide a builtin echo command which is similar or identical to this utility. Most notably, the builtin echo in sh(1) does not accept the -n option. Consult the builtin(1) manual page.

Documentation for NPM run-scripts

The actual shell your script is run within is platform dependent. By default, on Unix-like systems it is the /bin/sh command, on Windows it is the cmd.exe. The actual shell referred to by /bin/sh also depends on the system. As of [email protected] you can customize the shell with the script-shell configuration.

Here's also a related StackOverflow answer: "echo -n" works fine when executing script with bash, but not with sh

Upvotes: 1

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