ECS150 SQ16 Project 1


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You will be working with a partner for this project, you specify your partner in your
readme file. This specification is subject to change at anytime for additional clarification.
For this project, you and a partner will be implementing a fairly simple shell called
ashell. The shell must be able to execute applications, be able to setup pipes between
executed applications, redirect standard input/output from/to files for the executed
applications, and perform simple commands internally. You must provide a make file (or
cmake file) to compile your shell. Your program must be written in C or C++. You may
not use scanf, fscanf, printf, fprintf, cin, cout, or their derivatives; you must use read and
write system calls for all I/O. You may use the C++ containers. If you have any concerns
if a standard library function is allowed, ask before using it. Submit only one copy of
your project per pair on smartsite as either a zip or tar.gz file.
The shell must handle commands cd, ls, pwd, ff, and exit internally. Below are
descriptions of the commands:
cd [directory] – Changes the current working directory to specified directory. If
the optional directory is not specified, then the current working directory is changed to
the directory specified by the HOME environmental variable.
ls [directory] – Lists the files/directories in the directory specified, if no directory
is specified, it lists the contents of the current working directory. The order of files listed
does not matter, but the type and permissions must precede the file/directory name with
one entry per line. Below is an example listing
drwxr-xr-x .
drwxr-xr-x ..
-rwxr-xr-x ashell
-rwxr-xr-x main.cpp
pwd – Prints the current working directory name.
ff filename [directory] – Prints the path to all files matching the filename
parameter in the directory (or subdirectories) specified by the directory parameter. If no
directory is specified the current working directory is used. The order of the files listed
does not matter. Below is an example of a listing of ff main.cpp ECS150:
exit – Exits the shell.
ECS150 SQ16 March 27
Project 1
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The shell needs to be able to handle up and down arrows to select through the history of
commands. Only the most recent 10 commands need to be stored in the history. The up
arrow must toggle to the previous command, down arrow to the next command. If the
user attempts to navigate beyond the end of the list the audible bell character ‘\a’ (ASCII
0x07) must be output. In addition, if a user enters a backspace or delete and no characters
exist on the command to delete, the audible bell must be output.
The shell prompt must have the current working directory followed by the percent
symbol. If the full current working directory path is longer than 16 characters, then “/…”
should be prepended to the last level directory name. Below are examples:
A working example can be found on the CSIF at /home/cjnitta/ecs150/ashell.
You should avoid using existing source code as a primer that is currently available on the
Internet. You must specify in your readme file any sources of code that you or your
partner have viewed to help you complete this project. All class projects will be
submitted to MOSS to determine if pairs of students have excessively collaborated with
other pairs. Excessive collaboration, or failure to list external code sources will result in
the matter being transferred to Student Judicial Affairs.