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$IFSin there isecho $SHELLas you forgot to quote the variable expansion. Other than that, the value of$IFSis not relevant here.echoandechowrites the concatenation of them with space and a newline character to the pipe.$IFSis involved in thereadbuiltin command and unquoted parameter and arithmetic expansions and command substitutions and the expansion of"$*"and"${array[*]}"and that's about it.