journalctl

Linux · System · available in the simulator

What it does

Query and view system logs managed by systemd.

Syntax

journalctl [opciones]

Options and parameters

• -u

  Show logs for the specified unit.

  journalctl -u nginx
• -f

  Follow new log entries in real time.

• -n

  Show the specified number of recent lines.

  journalctl -n 100
• -b

  Show logs from the current boot.

• -p

  Filter by message priority, for example err.

  journalctl -p err -b
• --since

  Filter entries starting from the specified date/time.

  journalctl --since "2026-01-01"

Usage examples

• journalctl -u nginx
• journalctl -n 100
• journalctl -p err -b
• journalctl --since "2026-01-01"

Related commands

• apt-cache
• cal
• date
• df
• dpkg-deb
• dpkg-query