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.
Difference between system() and execl() functions
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.
Program for fork() system call
fork() is a system call used to create a new process. The new process is called a child process and the original process is called the parent process. The child process by default is a duplicate of the parent process.