#Introduction
A basic command shell to run executables in PATH with basic connector functionality. This project was created as an assignment for Mike Izbitchy's Spring 2015 CS100 course at UC Riverside.
See https://github.com/mikeizbicki/ucr-cs100/tree/2015spring/assignments/hw/hw0-rshell for further details.
#Installation
$ git clone https://github.com/cdixi001/rshell.git
$ cd rshell
$ git checkout hw0
$ make
$ bin/rshell
#Usage
Just like a normal terminal, commands are of the following form:
cmd = executable [ argumentList ] [ connector cmd ]
connector = || or && or ;
Exit with the command exit
For example the following runs ls -a and pwd, does not run ps, and exits.
username§host: ls -a && pwd || ps ; exit
Extra spacing has no effect on executing commands. Host name is limited to 32 characters to save space.
##Connectors
Valid connectors are || (or), && (and), and ; (new command).
Any other symbols will be read as part of a command. Errors resulting from such symbols will be part of regular command error outputs.
Connectors are read from left to right. A blank or empty expression is evaluated to true;
###Examples
$ ls -a || pwd
$ asdfasdf || ps
All files are listed. An error message for asdfasdf (an invalid executable) is shown and all current processes are listed.
$ ls -a && pwd
$ adsfsdf && ps
& ps && asdfasdf
All files are listed and currently directory is displayed. An error message for adsfsdf is shown. Current processes are displayed.
$ adfsdf ; pwd
An error message is shown and the current working directory is displayed.
Same as
$ adfsdf
$ pwd
####Multiple Connectors
$ && adsfsdf || ls && pwd || izbickisucks ; ps
An error message is shown. The contents of the current directory are displayed. The current working directory is displayed. The current processes are displayed.
#Known Issues April 19, 2015 11:53pm: make clean didn't work once. Worked before and after though.. April 19, 2015 9:30pm: None currently. If you find any, let me know.
#Works Cited(ish)
Mike Izbitchy https://github.com/mikeizbicki
Peter "Donut Boy" Hung https://github.com/phung001
http://stackoverflow.com/questions/4034750
http://cplusplus.com/reference/string/string/c_str
http://github.com/mikeizbicki/ucr-cs100/blob/2015spring/textbook/assignment-help/syscalls/exec.md