How to monitor multiple files?

To monitor multiple files using tail, you can use the -f option with multiple file names. Here’s how to do it:

Command Syntax:

tail -f file1 file2 file3

Example:

If you want to monitor two log files, for instance, app.log and error.log, you would run:

tail -f app.log error.log

Output:

This command will display the last 10 lines of both files and continue to show new lines as they are added to either file.

Additional Options:

• Using Wildcards: You can also use wildcards to monitor multiple files that match a pattern:

  tail -f /var/log/*.log

  This will monitor all .log files in the /var/log/ directory.

• Using -n Option: If you want to specify how many lines to show initially, you can combine it with -f:

  tail -n 20 -f app.log error.log

  This will show the last 20 lines of each file before following new entries.

If you have further questions or need more examples, feel free to ask!