What is lastlog command in Linux?
lastlog is a program available on most Linux distributions. It formats and prints the contents of the last login log file, /var/log/lastlog (which is a usually a very sparse file), including the login name, port, and last login date and time.
Can we clear var log lastlog?
Task: Clear last login information by deleting /var/log/lastlog. Press CTR+D to save the changes.
What is lastlog in var log?
/var/log/lastlog is a binary file that holds information about the last time that users logged in to the system. The lastlog file contains information about the last time a user has logged into the system.
How do I clear var log messages in Linux?
How to clean log files in Linux
- Check the disk space from the command line. Use the du command to see which files and directories consume the most space inside of the /var/log directory.
- Select the files or directories that you want to clear:
- Empty the files.
How use lastlog command in Linux?
If the user has never logged in the message ** Never logged in** will be displayed instead of the port and time….OPTIONS.
| Tag | Description |
|---|---|
| Print the lastlog records more recent than DAYS. | |
| -u, –user LOGIN | |
| Print the lastlog record for user with specified LOGIN only. | |
| The -t flag overrides the use of -u. |
How do I open a wtmp file in Linux?
We can also use the last command to read the content of the files wtmp, utmp and btmp as well. For example: # last -f /var/log/wtmp ### To open wtmp file and view its content use blow command. # last -f /var/run/utmp ### To see still logged in users view utmp file use last command.
Why is Lastlog so huge?
Answer. The file is a sparse file and is not actually taking up as much physical space as it shows. lastlog records the last login of each user. The large size merely shows you the potential size of the file if there were a maximum amount of users (around 2^32 users).
What is wtmp file?
Wtmp is a file on the Linux, Solaris, and BSD operating systems that keeps a history of all logins and logouts. On Linux systems, it is located at /var/log/wtmp. Various commands access wtmp to report login statistics, including the who and lastb commands. Log, Operating system, Operating System terms.
Can we remove var log messages?
All the logs are stored in /var/log by default. If your system is a testing system or you don’t really care what is in the log you can clear the log. But if you any of your application gives a error logs are the only place where you will find complete explanation.
Can we delete var log?
Yes you can. This file is executed every time you log in or launch a terminal instance, thus your logs will always be deleted.
How do I open an old wtmp file in Linux?
2 Answers. Presumably your wtmp file has been rotated, so try last -f /var/log/wtmp. 1 or last -f /var/log/wtmp. 0 to read the previous files.
How do I access wtmp?