BASH script echo text and a command

Question

This is seriously lame I know but...Im pulling my hair out on it.

Basically I Have this code:

getDisplayName(){
echo Display Name: $(/opt/vc/bin/tvservice  -n)
}

It returns this:

[E] No device present
Display Name:

I would expect it to be:

Display Name: [E] No Device Present

What am I missing?

TIA Ron

The error message is being sent to standard error, not standard output. — Barmar
– Barmar, Commented Apr 7, 2020 at 18:57

Jan Blumschein · Accepted Answer · 2020-04-07 20:22:19Z

2

Looks pretty much like the error message from /opt/vc/bin/tvservice goes to the standard error stream (not standard output), so it is not captured by $(). Try redirecting to standard output using ~~2&>1~~ 2>&1

getDisplayName(){
  echo Display Name: $(/opt/vc/bin/tvservice  -n 2>&1)
}

edited Apr 7, 2020 at 20:22

answered Apr 7, 2020 at 19:02

Jan Blumschein

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2 Comments

Cyrus Over a year ago

This creates a file with name 1. I suggest to use 2>&1.

Jan Blumschein Over a year ago

@Cyrus Yes, absolutely, thank you. Fxied the awnser.

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