lastb:tldr:3ad35
The command "sudo lastb --present ${hh:mm}" is used to display a list of recent failed login attempts on a Unix-like system using the "lastb" command with a time filter. Let's break down the command into its components:
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"sudo": This is a command used in Unix-like systems to run a command with administrative privileges or as the superuser. It allows the user to execute the following command with elevated permissions.
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"lastb": This command stands for "last bad login" and is used to view the list of failed login attempts maintained in the system's security log file. It reads the "/var/log/btmp" file by default.
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"--present": This option is used to filter the output of the "lastb" command to show only the entries with timestamps that are more recent than the specified time. The time format should be provided in the format "hh:mm", where "hh" represents the hour and "mm" represents the minutes.
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"${hh:mm}": This is a placeholder that should be replaced with the desired time in the format mentioned above. For example, if you want to see failed login attempts after 10:30, you would replace "${hh:mm}" with "10:30".
By running this command with appropriate time filtering, you can identify recent unsuccessful login attempts on your system. Generally, this is used to monitor security breaches or detect suspicious activity.