passwd command in linux is used to change the user password
Entity-Relationship Diagrams is a visual tool which is helpful to represent the Entity-Relationship model. It was proposed by Dr. Peter Chen in 1971.
Database management system is required to create, manage and delete database. It helps in efficient retrieval, insertion and deletion of data in the database.
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).
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()
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.
execl() or execlp() functions are used to replace the image of the current process with a new process image. In other words the current process code gets replaced by the new process code.