Concatenate in bash the output of two commands without newline character

You can use tr:

{ echo "The quick"; echo "brown fox"; } | tr "\n" " "

OR using sed:

{ echo "The quick"; echo "brown fox"; } | sed ':a;N;s/\n/ /;ba'

The quick brown fox

regex bash sed pipe concatenation

echo "$(A)" "$(B)"

should work assuming that neither A nor B output multiple lines.

$ echo "$(echo "The quick")" "$(echo "brown fox")"The quick brown fox

regex bash sed pipe concatenation

$ commandA () { echo "The quick"; }$ commandB () { echo "brown fox"; }$ x="$(commandA) $(commandB)"$ echo "$x"The quick brown fox

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