Use byobu-status to Inspect and Verify Byobu Status Helpers

You will finish with a safe way to inspect what the installed byobu-status command does, ask it for a diagnostic listing, and tell the difference between no output and a failed status helper. The examples use byobu 6.11-0ubuntu1.1 on this machine. They do not alter a Byobu profile or service.

Allow about ten minutes. You need a shell and the byobu package. Most checks are ordinary, unprivileged commands. A running Byobu session is useful for interpreting the normal status-bar path, but it is not required for the diagnostic checks below.

1. Confirm the installed command

Start by checking which executable your shell will run and which package supplied it:

$ command -v byobu-status
/usr/bin/byobu-status
$ dpkg-query -W -f='${Package} ${Version}\n' byobu
byobu 6.11-0ubuntu1.1

The exact version is significant. The installed manpage describes byobu-status as a program called periodically by the Byobu backend to gather the formatted strings for the lower status bar or bars. It is an internal status producer, not a general-purpose system information command with a stable, documented set of report flags.

Checkpoint: if command -v finds nothing, install or repair Byobu through your normal package-management process. Do not copy a script into /usr/bin by hand.

2. Observe the normal call without changing anything

Run the command with no argument from your current shell:

$ byobu-status
$ printf 'exit status: %s\n' "$?"
exit status: 0

On a shell that is not the Byobu backend context, no visible output is a normal result on this installation. The command prepares or reads backend-specific status data and normally receives a selector from Byobu. Do not treat an empty terminal as proof that every status item is healthy.

The command reads Byobu configuration and status helper files. If you keep personal settings in ~/.byoburc, those settings can change what the command sees. Read that file before debugging an unexpected result, but do not source an untrusted copy in a privileged shell.

3. Request the installed diagnostic listing

The installed script accepts --detail and prints the package version followed by the available status helpers and their descriptions:

$ byobu-status --detail | sed -n '1,18p'
byobu-6.11-0ubuntu1.1 Detailed Status Navigation
  Expand all - zr        Collapse all - zm
  Expand one - zo        Collapse one - zc
... status helper entries ...

The exact entries depend on the host. Some helpers can expose machine details such as the kernel release, network state, or pending diagnostic data, so review the output before pasting it into a ticket or chat. The sed command only limits what is displayed; it does not make the underlying report private.

Checkpoint: capture the exit status separately when you need to know whether every helper succeeded:

$ byobu-status --detail >/tmp/byobu-status-detail.txt
$ rc=$?
$ printf 'exit status: %s\n' "$rc"
exit status: 0

A zero status is the success result to expect when all work completes cleanly. On this host, the diagnostic listing included useful entries but returned status 1 because at least one helper failed. Treat a non-zero result as a prompt to inspect the output and the helper named near the failure, not as evidence that Byobu itself is unusable.

The temporary file above is safe to remove once reviewed:

$ rm -- /tmp/byobu-status-detail.txt

This removes only the diagnostic copy. Do not use a wildcard such as /tmp/*.

4. Test the backend selectors carefully

The script has selectors for the status-bar sides. A bare left selector is a harmless smoke test outside a configured backend:

$ byobu-status left
$ printf 'exit status: %s\n' "$?"
exit status: 0

With a live backend, the selector reads the configured left-side item list and prints the current text for each item whose cache is available. The corresponding right-side selector is right. Their visible output is host-specific and can be empty when no suitable context or cache exists.

Do not invent item names or expect left and right to be universal configuration interfaces. The manpage documents the backend role, while the installed script supplies these implementation selectors for this package version.

5. Understand cache and configuration changes

During normal operation, the command creates backend-specific status cache directories beneath Byobu's run directory and refreshes individual values according to their configured frequency. A new value is written before it replaces an older cached value, so a failed refresh can leave the previous non-empty value available.

That behaviour explains two common traps. First, an old-looking value is not necessarily proof that the helper ran successfully just now. Secondly, an empty result can mean that there is no previous usable cache. Check the current backend, the configured status item, and the helper's own diagnostics before deleting cache files.

Do not run byobu-status with sudo as a routine fix. Root can read a different home directory and configuration, and it can create files owned by root that the normal Byobu user cannot update. If you accidentally create such files, restore ownership only after identifying the exact Byobu run or configuration path; do not recursively change ownership of a broad directory.

6. Keep diagnostics separate from repair

byobu-status gathers and prints status. It can also trigger backend-specific maintenance such as a reload marker when date or time settings need updating. It is not a substitute for editing a status configuration deliberately, and its diagnostic output is not a request to run every command mentioned by a helper.

If a helper names a cleanup command, stop and inspect the path and files first. A cleanup suggestion involving crash reports, logs, caches, or service state can be destructive or privacy-sensitive. Preserve the evidence until you know why it is present. There is no universal undo for deleting such data.

For a running Byobu session, make configuration changes through the normal Byobu configuration workflow, then start a fresh session or use the documented reload path for the affected backend. Keep a copy of the previous configuration so you can restore it if the status bar stops rendering. Nothing in the checks above requires a service restart or elevated privileges.