Commands to Practice from Day 2

grep
grep [string] [file]
see p. 751

history : view your command history
.bash_history :This file in your home directory is what holds
	your history
echo :send something to the screen 
echo Linux is CSC128 : The screen says "Linux is CSC128"
pwd :print your working directory
date :show system date or set it if if you are root
cal :shows the current months calendar
cal -3 :shows 3 months calendar
cat :concatenate a file (send it past the screen)
touch [filename] :update a files modified time or create a 0-length file

ls
ls -l  :long listing of files by default . files are hidden
ls -la  :long listing of all files
Go to your home directory and and list all files, you will see that
there are a lot of files there that begin with a dot that configure your
account like .bash_history .bash_profile
ls -lh  :long listing in human readable format of files
ls -l  ~smauney :long listing of smauney's files
see p. 776

touch [filename] :creates a file

The concept of a pipe. 
Go to /etc and list the fies there in a long listing and they scroll off the 
screen, so you can use a pipe like this to pipe stuff to the "less" utility.
cd /etc
ls -l :the files scroll off the screen
ls -l |less    :now you can arrow around and see the output
q :quits the less pager. Also quits the pager for man pages
The pipe is the | symbol above the backslash



cp [source_file] [destination_file] :copying a file you can specify any 
 	absolute or relative pathname in either of these as long as you have
	permission to read the source file and permission to write in the
	destination directory.
Examples:
cp ~smauney/public/poem .    :copy seans poem to the current directory



diff [file1] [file2]   :see if there is differences between 2 files p. 715

mkdir [dirname] :make a directory p. 797

man ls :get the manual information on how to use the ls utility  p. 793
info ls   :more modern help system much like man but more features