Changes

'''Command History:''' '''~/.bash_history is used to store ''' stores recently executed command lines <span style="font-family:courier;font-weight:bold;><Up> or <Down></span> - move to previous command or next command<span style="font-family:courier;font-weight:bold;>fc -l </span> - display last 16 commands<span style="font-family:courier;font-weight:bold;>history </span> - display all stored commands<span style="font-family:courier;font-weight:bold;>!num </span> - re-execute command number "num"<span style="font-family:courier;font-weight:bold;>!xxx </span> - re-execute last command beginning with string "xxx"