13,420
edits
Changes
→INVESTIGATION 2: ADDITIONAL LOOPING STATEMENTS
# When prompted, enter a letter instead of a number. What happens?<br>Does the shell script allow you to enter an invalid grade like '''200''' or '''-6'''?<br><br>
# Use a text editor like vi or nano to create the text file called '''for-6.bash''' (eg. <span style="color:blue;font-weight:bold;font-family:courier;">vi for-6.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>
# Enter the following lines in your shell script:<br><span style="color:blue;font-family:courier;font-weight:bold;"><span style="font-weight:bold;font-family:courier;">
value=1<br>
while [ $value -le 5 ]<br>
((value=value+1)) # could also use ((value++))<br>
done<br>
</span></span><br><br>
# Save your editing session and exit the text editor (eg. with vi: press '''ESC''', then type ''':wx''' followed by '''ENTER''').<br><br>
# Issue the following linux command to add Set execute permissions for your this shell script:<br><span style="color:blue;font-weight:bold;font-family:courier;">chmod u+x for-6.bash</span><br><br># Run and run your shell script by issuing: <span style="color:blue;font-weight:bold;font-family:courier;">./for-6.bash</span><br><br>What do you notice?
:In the next investigation, you will learn to create and test-out the '''~/.bashrc''' start-up file to customize your Bash shell.
