So turns out the culprit was this:
ENV_VAR=$(hostname -i)
Needs to be:
ENV_VAR=$(echo -n $(hostname -i))
Feel free to suggested a cleaner way of doing it…
Maybe:
ENV_VAR=$(hostname -i | tr -d '\n')
Exadra37
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OvermindDL1
That should work just fine, trailing newlines are not kept… o.O
╰─➤ ENV_VAR=$(hostname -i)
╰─➤ ENV_VAR1=$(echo -n $(hostname -i))
╰─➤ [ "${ENV_VAR}" = "${ENV_VAR1}" ] && echo they are identical || echo they are not identical
they are identical
So… that’s weird… o.O
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Exadra37
You need to save the output into a file to see the new line and see the file in a text editor, cat will not show the new line 
With new line in the file:
$ hostname -i > out.txt
$ echo $(hostname -i) > out2.txt
Without a new line in the file:
$ echo -n $(hostname -i) > out3.txt
$ hostname -i | tr -d '\n' > out4.txt
My shell
$ echo $SHELL
/usr/bin/zsh
$ echo $ZSH
/home/exadra37/.oh-my-zsh
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OvermindDL1
That’s saving to a file though, which would have a newline. The thing about a variable in bash/zsh is that it doesn’t keep the newline because newlines are part of $IFS (well, unless you changed $IFS, which would break a lot of things), so I’m still thinking a " is in use somewhere where it shouldn’t be (which inhibits the this)?
For note though, replacing a newline via calling another program can be slow in a loop, so you’d probably want to use shell-string-replacement instead (like NR='\r' then %{blahvar%$NL}), but if not in a tight loop it doesn’t matter. ^.^
Still though:
╰─➤ BLAH=$(hostname -i)
╰─➤ printf ">${BLAH}<"
>127.0.1.1<%
╰─➤ printf ">${BLAH}<\n"
>127.0.1.1<
# Now of course streaming the variable into a program will include the newline:
╰─➤ wc <<< "$BLAH"
1 1 10
# But passing it as an argument will not:
╰─➤ perl -e 'print $ARGV[0]; print " -> "; print length($ARGV[0])' $BLAH
127.0.1.1 -> 9%
╰─➤ python3 -c 'import sys; print(repr(sys.argv)); print(len(sys.argv[1]))' $BLAH
['-c', '127.0.1.1']
9
╰─➤ elixir -e 'System.argv() |> IO.inspect(); System.argv() |> hd() |> String.length() |> IO.inspect()' $BLAH
["127.0.1.1"]
9
So I think I’m still not seeing enough of your script to see the issue, like where and how the ENV_VAR is used… ^.^;
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