Minor Now that JENKINS-33599 changed the password to be written to a file, it would be more convenient for copy-pasting if the password was printed on its own line — i.e. the file should end with a (platform-specific) newline character.
With the 2.0 beta, I saw this:
chris@rebigulator:~$ cat /tmp/j2beta/secrets/initialAdminPassword c84b4a5991db49ef9d431159421107bdchris@rebigulator:~$
The setup wizard unlock field has been changed to a password field, so that also didn't help me in seeing that I had made a mistake in copying the password.
Here the password is just written straight to the file:
https://github.com/jenkinsci/jenkins/blob/1735f3c/core/src/main/java/jenkins/install/SetupWizard.java#L64
[JENKINS-33857] Setup wizard password file should end with a newline
Yeah, that looks good.
I think it would be nice to include this for 2.0 — it's still a few weeks away, and this small stumbling block happened literally within 30 seconds of starting up the 2.0 beta 
But you're the release boss! If I get my ICLA accepted soon, I'll at least submit this as a PR, unless someone beats me to it.
Code changed in jenkins
User: Christopher Orr
Path:
core/src/main/java/jenkins/install/SetupWizard.java
http://jenkins-ci.org/commit/jenkins/3659e9cfaa496c71c7d0152f24740bb33194706f
Log:
[FIXED JENKINS-33857] Make initial admin password file end with a newline.
This makes it a tiny bit more convenient to `cat` the file and copy the password
to your clipboard. Previously, the file did not have a line ending, so the
password would run into your shell prompt, making copying the text harder.
Code changed in jenkins
User: Daniel Beck
Path:
core/src/main/java/jenkins/install/SetupWizard.java
http://jenkins-ci.org/commit/jenkins/b633f883477af58be17b83e10c4d7325c2ed9e13
Log:
Merge pull request #2201 from orrc/2.0
[FIXED JENKINS-33857] Make initial admin password file end with a newline
Compare: https://github.com/jenkinsci/jenkins/compare/6b6ae729a904...b633f883477a
I think this should do it?
$ git diff diff --git a/core/src/main/java/jenkins/install/SetupWizard.java b/core/src/main/java/jenkins/install/SetupWizard.java index 6c9b53a..7b9a889 100644 --- a/core/src/main/java/jenkins/install/SetupWizard.java +++ b/core/src/main/java/jenkins/install/SetupWizard.java @@ -82,7 +82,7 @@ public class SetupWizard { // JENKINS-33599 - write to a file in the jenkins home directory // most native packages of Jenkins creates a machine user account 'jenkins' to run Jenkins, // and use group 'jenkins' for admins. So we allo groups to read this file - iapf.write(randomUUID, "UTF-8"); + iapf.write(randomUUID + System.lineSeparator(), "UTF-8"); iapf.chmod(0640);TBH I'd hesitate to include this in 2.0. It's clearly an improvement, clearly not critical… as usual, let's just hold for 2.1 and make that one an overloaded, broken mess of a release.