Index of /school/Computer Science/cs153/as1/

Ryan Hoskin XXX-01-3343 Computer Science 153 Assignment 1 - Basic Shell My program is a basic shell that can run various command such as cd, pwd, along with other executable programs that are on the system. First, my program uses my shell class, fsh. Fsh contains various functions that will take in the user input, parse that input, run the specified command, and return some output. Along with this, a history of the commands entered are stored in the fsh class, allowing the user to execute past commands by !# notation or the past command by executing the !! command. How my program works specifically is to first take in the command, then this command is checked to see if it is an internal command. If the entered command is not an internal command, then the command is passed to a parsing function that will parse the given input. While the command is being parsed it checks for certain special characters such as "&" or "|". If these characters are detected in the command string then other functions will be called. If the pipe character "|" is encountered, the mypipe function is called, where the output of the first program is redirected and used as the input for the second executable. After this is achieved each program is executed. Within this execution the program is searched for in the find function, and if it is found as an executable on the system then it will be executed. If one of the redirect operators are found, ">", ">>", or "<", the redirect function is called, where the input or output of the input/output stream is redirected to the specified source/output. To view the history a user can type: "history" To view the present working directory: "pwd" To change a directory: "cd <dir>" To exit: "exit" To compile the executable type "make" in a shell, and the executable created will be named "myshell".