Returning tr output to variable: Command Not Found

Question

N = hostname
echo $N //Output: ABC123
echo $N | tr [:upper:] [:lower:] //Output: abc123
N = $(echo $N | tr [:upper:] [:lower:]) //Output: Command not found

I can modify the hostname using tr and send it to the terminal, but I can't put it back into a variable. Why?

too much spaces : `N=$(...)` would likely work; isn't the exact error message `-bash: N : command not found` ? `N = something` is parsed as `launch the 'N' command with parameters '=' and 'something'`. — Aaron, Dec 03 '18 at 15:46
I also suggest to use [shellcheck](https://www.shellcheck.net/) to lint your scripts, it would have caught this error. — Aaron, Dec 03 '18 at 15:51

score 1 · Accepted Answer · answered Dec 03 '18 at 15:48

1

There's two extra spaces surrounding the assignment operator (=).

N=$(echo $N | tr [:upper:] [:lower:])

The command above will work.

answered Dec 03 '18 at 15:48

dbakiu

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Thank you! I still have seven minutes until I can mark the correct answer, but thank you for quick reply. – user3846899 Dec 03 '18 at 15:53

Returning tr output to variable: Command Not Found

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