Changes

<table width="60%"><tr><td><span style="font-family:courier;font-weight:bold;><up></span> or <span style="font-family:courier;font-weight:bold;><down></span> </td><td>move Move to previous command or next commandwithin Bash shell prompt</td></tr><tr><td><span style="font-family:courier;font-weight:bold;>fc -l</span></td><td> display last '''16 ''' commands</td></tr><tr><td><span style="font-family:courier;font-weight:bold;>history| more</span></td><td>display all stored commands</td></tr><tr><td><span style="font-family:courier;font-weight:bold;>!num</span></td><td>re-execute command number "num"(determined from ''history'' command)</td></tr><tr><td><span style="font-family:courier;font-weight:bold;>!xxx</span></td><td>re-execute last command beginning with string "xxx"</td></tr></table>