Unix Interview Questions

What is UNIX? UNIX is an operating system. Unix was developed at Bell Labs in 1969 It is a stable, multi-user, multi-tasking system for servers and desktops. With the notable exception of Microsoft Windows, all current major operating systems have some kind of Unix at their cores. Unix is written in the C language. What is KERNAL? It is the hub of operating system.It allocates tine and memory to programs and handles all type of files.Shell and kernel are work together. Shell searches the file store in the operating system and request to the kernel with the help of system call. What is SHELL? Shell is the interface between user and kernel. The shell is a command line interpreter (CLI). It interprets the commands. How we find out the current directory , parent directory? With the help of cd. And cd.. How to print current working directory? With the help of pwd command . How we go in home directory? With the help of ~ character. What is the syntax to move one directory to other ? mv file1 file2 moves (or renames) file1 to file2 What is the command for clear the screen ? %clear What are the unix help command ? Man , whatis , apropos What are the mode is takes place in unix? User , group and other. How to terminate single process? With the help of kill command What are shell variables ? shell variables are system environment variables. They include SHELL , TERM, MAIL. the output of the shell variable $>echo $TERM ansi What is the major advantage of a hash table? The major advantage of a hash table is its speed. Because the hash function is to take a range of key values and transform them into index values in such a way that the key values are distributed randomly across all the indices of a hash table. what is the file server? File server that’s share disk storage and file with other m/c on network.