Changes

# Run your shell script by issuing: <span style="color:blue;font-weight:bold;font-family:courier;">./if-5.bash </span><br><br>When prompted, enter a '''letter''' <u>instead</u> of a ''number''. What happens?<br><br>Let's edit the '''for-5.bash''' shell script to perform '''error-checking''' to <u>force</u> the user to enter a numeric value between 0 and 100.<br><br>'''NOTE:''' The '''while''' statement can be used with the '''test''' command (or a simple linux command or a linux pipeline command) for error checking. In our case, we will use a pipeline command with extended regular expressions. In order to loop while the result is TRUE (not FALSE), you can use the negation symbol (!) to set the test condition to the opposite.<br><br>

# Use a text editor like vi or nano to edit the text file called '''if-5.bash''' (eg. <span style="color:blue;font-weight:bold;font-family:courier;">vi if-5.bash</span>)<br><br>If you are using the nano text editor, refer to notes on text editing in a previous week in the course schedule.<br><br>

# Save your editing session and exit the text editor (eg. with vi: press '''ESC''', then type ''':x''' followed by '''ENTER''').<br><br>

# Run your shell script by issuing:<br><span style="color:blue;font-weight:bold;font-family:courier;">./for-5.bash</span><br><br>