Introduction to Linux Environment Quiz Questions and Answers
Answer :
bz2
Explanation :
Three tools for compression :
-z , --gzip (tar.gz) - it will compress quickly but the size will not reduce much
-j. --bzip tar.bz2 it will take more time compared to gzip but it will create small size compared to gzip)
-J, --xz tar.xz (it will take long time and it will compressed to the most )
edit the /etc/ssh/ sshd_config con?guration ?le to allow or prohibit users logging in to the system as root. Add below and save and exit
PermitRootLogin yes
Explanation :
The OpenSSH server uses the PermitRootLogin con?guration setting in the /etc/ssh/ sshd_config con?guration ?le to allow or prohibit users logging in to the system as root.
PermitRootLogin yes
With the PermitRootLogin parameter to yes, as it is by default,
wc - command helps to count the words, letters and byte counts for each file
w - to see how many users logged in currently
cat to display the file content
ls - to list all the files in current working directory
/var/log/messages Most syslog messages are logged here. Exceptions include messages related to authentication and email processing, scheduled job execution, and those which are purely debuggingrelated.
To send a message to the rsyslog service that gets recorded in the /var/log/boot.log log ?le, execute the following logger command:
[root@host ~]# logger -p local7.notice "Log entry created on host"
The use of the -a option makes usermod function in append mode. Without -a, the user will be removed from any of their current supplementary groups that are not included in the -G option's list.
Press : (colon). The cursor should reappear at the lower left corner of the screen beside a colon prompt. Type : wq or x it will save the file and exit
Save a file and exit.
