How can I concatenate pipeline string into file

Question

How can I node -pe "require('./package.json').version" with prefix HELLO into file?

node -pe "require('./package.json').version" | "HELLO" + $res > file.txt is not working.

I want to use single line command (not full multiline bash script)

Simple demo

echo "world" | "HELLO" + $res > file.txt

The expected output in file - HELLO world

Please add output of `node -pe "require('./package.json').version"` and your desired output for that sample input to your question. — Cyrus, Jun 23 '19 at 06:56
See: [Add a prefix string to beginning of each line](https://stackoverflow.com/q/2099471/3776858) — Cyrus, Jun 23 '19 at 07:00

score 0 · Accepted Answer · edited Jun 23 '19 at 13:10

0

Your $res variable doesn't get set
Pipe is for redirecting the output of a program/script to the input of another program; this second program is missing in your line

The solution could be something like this (not tested):

echo "HELLO" + $(node -pe "require('./package.json').version") > file.txt

$(command substitution) captures the output of a command.

edited Jun 23 '19 at 13:10

vintnes

answered Jun 23 '19 at 07:09

Enno Gröper

1 Answers1