Linux Survival Basics
Read-onlyRead the Failure Cause in systemctl Status
A systemd service is failed and you need the active state, exit status, unit paths, and the most recent failure lines in one read-only check.
Command
systemctl status app-worker --no-pager --lines=50Before you run this
System impact: Read-only. Low when scoped to the shown target.
When not to use it: Do not stop at status when the failure is intermittent, old, or missing context; follow up with journalctl and systemctl show.
Expected output
A failed active state, Result value, ExecStart exit status, and recent lines showing the failing startup step.
System impact
Read-only. Nothing changes. systemctl prints service metadata, process exit status, and recent journal lines.
Recovery / rollback: no state is changed.
When to use it
Use first when a specific service is failed and you need a fast summary before deeper journal or unit-file inspection.
When not to use it
Do not stop at status when the failure is intermittent, old, or missing context; follow up with journalctl and systemctl show.
next steps
Related commands
Compare Failure Output With the Effective Unit
Put the failed step next to the unit config that created it.
systemctl status app-worker --no-pager --lines=50 && systemctl cat app-worker
Inspect One Service Without Pager Traps
Make systemctl status safe for scripts, screenshots, and quick incident notes.
systemctl status nginx --no-pager --lines=30
Read One systemd Timer Status
Timer status shows whether the schedule is loaded and active.
systemctl status backup.timer --no-pager
Check logrotate Timer Status
The timer may be disabled, missed, or failing.
systemctl status logrotate.timer --no-pager
Print the Exact systemd Exit Fields
Turn a noisy service failure into four fields you can paste into an incident note.
systemctl show app-worker --property=Result,ExecMainCode,ExecMainStatus,NRestarts --no-pager
Study mapping
Use this as independent command practice: read the notes, predict the output, then compare it with the example before using a real shell.
Independent study support only. No affiliation, endorsement, exam dumps, or real exam questions.