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Sample output: Errors
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/home/brian/cmpt300/SVN/2015-1 Spring/as2-Shell> cd notehun
Invalid directory.
/home/brian/cmpt300/SVN/2015-1 Spring/as2-Shell> cd thoaenu eo oeu oe u   
Invalid directory.
/home/brian/cmpt300/SVN/2015-1 Spring/as2-Shell> ntahoeunthao
ntahoeunthao: Unknown command.
/home/brian/cmpt300/SVN/2015-1 Spring/as2-Shell> hoet the h ehtoun 
hoet: Unknown command.
/home/brian/cmpt300/SVN/2015-1 Spring/as2-Shell> echo Just testing
Just testing
/home/brian/cmpt300/SVN/2015-1 Spring/as2-Shell> !!
echo Just testing
Just testing
/home/brian/cmpt300/SVN/2015-1 Spring/as2-Shell> !oops
SHELL: Unknown history command.
/home/brian/cmpt300/SVN/2015-1 Spring/as2-Shell> history
1	cd notehun
2	cd thoaenu eo oeu oe u
3	ntahoeunthao
4	hoet the h ehtoun 
5	echo Just testing
6	echo Just testing
7	history
/home/brian/cmpt300/SVN/2015-1 Spring/as2-Shell> ^C
1	cd notehun
2	cd thoaenu eo oeu oe u
3	ntahoeunthao
4	hoet the h ehtoun 
5	echo Just testing
6	echo Just testing
7	history
/home/brian/cmpt300/SVN/2015-1 Spring/as2-Shell> exit
brian@ubuntu:~/cmpt300/SVN/2015-1 Spring/as2-Shell$