I have to write an interface in c.

The executable of your program must be named naiveinterface. Your makefile must ensure this. The naiveinterface program must support the following usage: naiveinterface [scriptfile]. When no arguments are given, naiveinterface should enter a loop in which it accepts one command at a time as keyboard input (e.g., using scanf). The user types a command, and then presses return on the keyboard to execute it (i.e., the command will end with a newline character). Your program must block until the command completes and, if the return code is abnormal, print out a message to that effect. Alternatively, your program should open the given file (if one is provided) and interpret the contents as a sequence of commands to execute. You may assume that each line of the script file corresponds to one command. Your user interface should accept and support the following commands:

quit: When this command is encountered, naiveinterface should stop processing commands, prompt the user for confirmation (i.e., Are you sure you want to exit? All files will be lost! Y/N), accept the user input, delete all data structures and intermediate files (if any) created, and exit.

Output redirection: Your naiveinterface program should allow output to be redirected to a file (e.g., executing the command srchindx -o ALT indx.txt flightdata > foo.txt should execute srchindx in the flightdata directory and print its output in file foo.txt).

create: This command is used for creating new files, directories, and links. This is a separate program that can be executed by naiveinterface, or can be executed from a terminal by running its executable file. The create program should support the following usage:

create -f filepath creates an empty, ordinary file whose name is given in the specified path. The path can be an absolute pathname, a relative pathname, or just a bare filename, in which case the file should be created in the current directory. The new file should have permission 0640 specified in octal. 1

create -d dirpath creates a new directory whose name is given in the specified path. The new file should have permission 0750 specified in octal.

create -h oldname linkname creates a hard link. oldname is the path or name of an existing file, and linkname is the path or name of the hard link to be created.

create -s oldname linkname creates a symbolic (i.e., soft) link. oldname is the path or name of an existing file, and linkname is the path or name of the symbolic link to be created.