Remove newline character after pipe

I want to do Base64 encode with a command echo -en "my_message" | openssl sha1 -hmac "secret_key" | base64 The output string of openssl is as expected, but the output of base64 is not as the output from openssl has a new line character. If I run the command echo -en "my_message" | openssl sha1 -hmac "secret_key" | xargs echo -n | base64 Then the final output is correct. I wonder if there is a more elegant way for this command