How to use groupdel command in Linux?
groupdel command is used to delete all entries related to a group in the system. The named group must exist. Syntax: groupdel [options] GROUP
How to use groupmod command in linux?
groupmod command in linux is used to modify the information related to any existing group. Syntax groupmod [options] GROUP
How to use groupadd command in Linux?
groupadd command in linux is used to create a new group. groupadd [Options] group. The list of existing groups in the system is available in /etc/group file
How to use usermod command in Linux?
usermod command in linux is used to modify an existing user’s account information. Only the super user can use this command.
How to use userdel command in linux?
userdel command in linux is used to delete an existing user and related files. Only the super user can use this command.
How to create users using useradd command in Linux?
useradd command is used to add a new user in the system. In other words it is used to create a new login account for a different user. useradd command can be used only by the root user.
How to change password using passwd command in Linux?
passwd command in linux is used to change the user password
How to display date using date command in Linux
to set or print the system time and date. date [OPTION]… [+FORMAT]. $date. Output: Tue Aug 27 09:54:25 DST 2019. Explanation : the date command prints the current date and time of the system in a fixed format string as above. The format string is Abbreviated_week_day abbreviated_month day_of_the_month time(hh:mm:ss) time_zone YYYY(year).
What is a Zombie Process?
Zombie process is a process which has terminated but its entry still exists in the process table until the parent terminates normally or calls wait()
Difference between Process and Thread
If you are a programmer, you create a program by writing a code and when you run that program it becomes a process. It is very important to have a clear difference between a program and a process because one program can produce many running processes that are just different versions of a single program.