.JOURNAL File Extension

2 file types use the .journal file extension.

Linux Journald Event Log

Developer N/A
3.5  |  2 Votes

What is a JOURNAL file?

A JOURNAL file is a system and service log created by Linux. It contains a record of system- and service-level kernel, boot, and component events. Administrators can use JOURNAL files to troubleshoot startup or service issues.

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Many versions of Linux use a system management daemon named systemd. Systemd includes an event logging service named journald. This service regularly produces JOURNAL files.

Each JOURNAL file contains a log of system- and service-level events. This log can include kernel and boot events, syslog events, and service events. It is saved in a binary format.

Journald typically saves JOURNAL files in one of the following directories:

  • /​run/​log/​journal
  • /​var/​log/​journal

Active user-level JOURNAL files are named user-####.journal. Active system-level journal files are named system.journal. Archived JOURNAL files have similar filenames, but their filenames also include an @ and several letters and numbers.

Common JOURNAL Filenames

System.journal - An active system-level JOURNAL file.

User-####.journal - An active user-level JOURNAL file.

How to open a JOURNAL file

In a Linux system that uses systemd, you can use the journalctl command to view the entries a JOURNAL file contains. For example, you could use the command journalctl --file /path/to/your/journalfile.journal to view the log journalfile.journal contains.

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Programs that open JOURNAL files

Use [c]journalctl --file[/c] command to view log entries

4th Dimension Data Log

Developer 4D
1.7  |  3 Votes

A JOURNAL file may also be a record of the operations performed on a 4th Dimension database's data (.4DD file). For example, a JOURNAL file records changes, additions, and deletions made to its associated 4DD file. 4th Dimension creates JOURNAL files for each 4DD file by default.

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4D 4th Dimension is a software development program that developers use to create desktop, web, and mobile applications. As part of creating these applications, developers construct and fill databases. Each database's structure is saved in a .4DB file; its data is saved in a 4DD file.

If an app development project has the Use Log option selected (as it is by default), 4th Dimension will also create a JOURNAL file for the app's database. The JOURNAL file contains a record of all the operations performed on a database's data since its last backup. This allows developers to troubleshoot problems with their databases and roll the database back to a previous post-backup state if necessary. When a developer backs up a database, 4th Dimension deletes the previous JOURNAL file and creates a new, blank JOURNAL file in which to begin recording new database changes.

Common JOURNAL Filenames

Data.journal - The default name 4th Dimension assigns to JOURNAL files.

How to open a JOURNAL file

You can open a JOURNAL file in 4D 4th Dimension (Windows, Mac) as part of an associated development project. The file is typically named data.journal and stored in the project's Data folder.

Programs that open or reference JOURNAL files


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