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Tutorial10: Shell Scripting - Part 1

721 bytes added, 11:07, 3 September 2020
INVESTIGATION 2: USING VARIABLES IN SHELL SCRIPTS
# Issue the following linux command to change to the Bourne Shell (a different shell than the default Bash):<br><span style="color:blue;font-weight:bold;font-family:courier;">sh</span>
# Issue the following linux command to confirm you are in the Bourne Shell:<br><span style="color:blue;font-weight:bold;font-family:courier;">echo $SHELL</span><br><br>You should see the output of the command that you are located in the Bourne Shell.<br><br>
# Run your '''hello.bash''' shell script.<br><br>What shell does the shell script indicate is running?<br><br>This is because there is NO shebang line so this Bash shell script is being run in the Bourne Shell.<br><br>Let's add a she-bang line to the top of this shell script file so it forces the shell script to run in the Bash Shell instead of the Bourne Shell.<br><br># Use a text editor to edit the shell script called '''hello.bash'''<br><br># Add the following line to the TOP of the file:<br><span style="font-family:courier;">#!/bin/bash</span><br><br># Run your '''hello.bash''' shell script.<br><br>What shell does the shell script indicate is running?<br><br>This is because of the shebang line indicating to run the shell script in the Bash shell although you ran this script within the Bourne Shell.<br><br>Let's add a she-bang line to the top of this shell script file so it forces the shell script to run in the Bash Shell instead of the Bourne Shell.<br><br>   
# Enter the following linux command to return to your Bash shell: <span style="color:blue;font-weight:bold;font-family:courier;">exit</span><br><br>
# Use a text editor to edit the shell script called '''hello.bash'''<br><br>
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