Top Linux System Calls Interview Questions :: ALLInterview.com http://www.allinterview.com Top Linux System Calls Interview Questions en-us what is segmentation fault? http://www.allinterview.com/showanswers/28352.html access to the memory which is not valid, will cause segmentation fault. Let us take example, in dynamic memory allocation like malloc, we allocate memory and then we free it using: free(fp); if we write free() one more time say , free(f What is the use of proc structure? http://www.allinterview.com/showanswers/28354.html All the running process created by the uere will have entry as a file in the /proc directory. What are the signals we have in Linux http://www.allinterview.com/showanswers/28351.html There are more that 15 different signal. Listing some of the frequently used signals below STOP - This signal will stop the currently running process. The process will still stay in the task list CONT - Will continue the stopped process What will happen when we invoke a system call and say with an exampl http://www.allinterview.com/showanswers/28355.html Sysem call is an interface between process and the operating system. To See what happens when we invoke a system call we can take an example. If a system call is made to terminate the currently running program , a dump of the memmory is taken what is nis server http://www.allinterview.com/showanswers/75888.html The Network Information Service (NIS) provides a simple network lookup service consisting of databases and processes. A good howto: hxxp://www.debian-administration.org/articles/36 how to configure ftp server on redhat linux? http://www.allinterview.com/showanswers/75885.html RHEL server comes with vsftpd which is the Very Secure File Transfer Protocol (FTP) daemon. The server can be launched via a xinetd or as standalone mode, in which case vsftpd itself will listen on the network port 21. Install vsftpd: # yum in what is the diff b/w MUTEX and semaphore? http://www.allinterview.com/showanswers/57747.html mutex is the name given to the binary semaphore where as semaphore is general not binary. what is bus trap. http://www.allinterview.com/showanswers/28353.html A bus trap occurs when the CPU attempts to fetch from nonexistant memory or when the CPU attempts to store in nonexistant or read-only memory how to create a ftp user on redhat linux 4.0? http://www.allinterview.com/showanswers/75943.html any user is ftp user. if root user forget the password how to change it? http://www.allinterview.com/showanswers/75881.html You can reset forgotten root password under Linux by booting system into single user mode or emergency mode (also known as rescue mode). Following is the procedure to reset root password if you are using GRUB as a boot loader: 1.Select the k what is sudo on linux? http://www.allinterview.com/showanswers/75892.html The sudo command stands for "superuser do". If a server needs to be administered by a number of people it is normally not a good idea for them all to use the root account. This is because it becomes difficult to determine exactly who di how to configure sendmail server on red hat linux version 4 and what http://www.allinterview.com/showanswers/75887.html to add to the above answer install sendmail-cf rpm after installing it just run service sendmail restart after any changes to sendmail.mc How to give the root permision to users? http://www.allinterview.com/showanswers/75880.html The sudo command stands for "superuser do". If a server needs to be administered by a number of people it is normally not a good idea for them all to use the root account. This is because it becomes difficult to determine exactly who di why the kernel panic error was appering? http://www.allinterview.com/showanswers/84181.html Kernel panic error occurs when a Linux OS files may missing linux system its not booting up its showing groub error what i need http://www.allinterview.com/showanswers/75884.html Need to know the grub error code for suggesting the resolutions. Errors Reported by the Stage 1 ------------------------------ The general way that the Stage 1 handles errors is to print an error string and then halt. Pressing Ctrl-Alt-Del will