Flush

Group 199's implementation of Famous little unix shell. Flush is a basic shell written in C to be run on UNIX machines.

How-to

Build from source by running make (requires gcc). Then run the binary flush.o.

Functionality

Running programs by absolute path or PATH search

These lines exhibit the same behaviour

$ /usr/bin/ls

$ ls 

Change working directory

/usr/ $ cd bin

/usr/bin/ $

Exit the shell

These lines exhibit the same behaviour

$ exit

$ ^d

IO-redirection

Write output to foo

$ ls > foo

Read from foo and write result to bar

$ wc -l < foo > bar

!! Multiple input, or output redirects not supported !!

$ ls > foo > bar     <- Illegal syntax

Background jobs

$ sleep 1 &        
> [sleep 1] - pid     -> sleep 1 now running in background with process id = pid

Run 'jobs' to see current background processes

$ jobs
> Background jobs:
> [sleep 1] - pid

Piping

$ ls | grep .o | wc -l
> 1

Commands with pipes can be backgrounded