#Rshell Project Program Overview rshell: This is a basic shell program that uses execv to call commands.

ls: this implements the ls command where rshell is the root folder. It only takes in flags -a, -l, and -R. Any other flag will be treated as if it were an invalid flag.

cp: Copies files and compares the runtime of different methods of copying.

How to Use rshell: Treat this shell as if it were bash. However, there are some limitations to this program, which are discussed below. In order to exit the program, simply type in "exit".

ls: Treat this program as if it were the ls command. In the rshell directory, call bin/ls and type in extra arguments after.

Installation Guide

1. Clone this repository using, http://github.com/churslic/rshell.git . Or else download the zip on the same webpage.
2. Type in make. All executables will be put in a bin folder. Alternatively, you may type make and then the executable you wish to use.

Bugs/Limitations/Issues

rshell:

• Connectors: For example, typing in ls#pwd into bash would not execute, but in this program, it will ignore #pwd and execute ls. This program will also not allow connectors to be the last argument typed in. For example ls; pwd; or ls || are not allowed.
• Exit: Normally exit | cat file1 would actually print out the content of file1, but in this shell, any time exit is the very first command, everything after it is ignored and the program will terminate.
• Input/Output redirection: Multiple input calls OR multiple output calls will be treated as errors. For example, cat < file1 < file2 or cat file1 > file2 > file3 will be treated as an error.
• cd: cd without any arguments will not change the directory to the home directory. cd dirName at the beginning of any command will ignore everything after it. This is true for most cases in the actual bash shell, but this does not always happen, so therefore this is listed as an issue here.

ls:

• The formatting is done rather basically. It's default output is to print out with only 5 columns of minimum 14 width. If the file name were to exceed this length, then the output will look crazy.