CLI Variables - Revision history

Rwlove at 20:02, 17 May 2008

2008-05-17T20:02:48Z

2008-05-17T19:45:36Z

2008-05-17T19:26:55Z

Introduction

2008-05-17T19:26:18Z

Example #3 - Use in scripting

2008-05-17T19:24:45Z

Example #3 - Use in scripting

2008-05-17T19:23:13Z

Example #3 - Use in scripting

2008-05-10T19:57:48Z

2008-04-19T19:58:59Z

2008-04-19T19:51:30Z

Quiz

2008-03-29T19:19:21Z

Quiz

@@ Line 46: / Line 46: @@
 .99
-What you need to do is tell bash that you don't want
+What you need to do is tell bash that you don't want the '$'
 == Quiz ==

@@ Line 30: / Line 30: @@
 This would cause the statement to evaluate to true and TRUE would be printed to the screen. In English it would say, "If 1 equals 1 then echo TRUE."
 == Quiz ==
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 # Using the GEEK environment variable, how would you echo the statement, "I think that FREE GEEK is the best!"?
 # Can you tab-complete environment variables?
 == Instructor Notes ==

@@ Line 1: / Line 1: @@
 == Introduction ==
-Environment variables are used for a variety of examples within the bash environment. They can be defined by the user or defined by bash. If they're created by bash then they're likely to be used by bash to define its behavior. Also, many bash scripts use environment variables to store information which will be used later in the script.
+Environment variables are used for a variety of reasons within the bash environment. They can be defined by the user or defined by bash. If they're created by bash then they're likely to be used by bash to define its behavior. Also, many bash scripts use environment variables to store information which will be used later in the script.
 == Commands ==

@@ Line 29: / Line 29: @@
   FOO=1
-This would cause the statement to evaluate to true and TRUE would be printed to the screen.
+This would cause the statement to evaluate to true and TRUE would be printed to the screen. In English it would say, "If 1 equals 1 then echo TRUE."
 == Quiz ==

@@ Line 25: / Line 25: @@
   if [ ${FOO} -eq 1 ] ; then echo "TRUE" ; else echo "FALSE ; fi
-Create an environment variable FOO that evaluates to 1.
+The -eq statement checks to see if ${FOO} is equal to 1. Create an environment variable FOO that evaluates to 1 before running the statement.
   FOO=1
 == Quiz ==

@@ Line 21: / Line 21: @@
 === Example #3 - Use in scripting ===
-Imagine you have the following conditional statement,
+Imagine you have the following conditional statement and you wanted it to print "TRUE" to the screen.
   if [ ${FOO} -eq 1 ] ; then echo "TRUE" ; else echo "FALSE ; fi
 == Quiz ==

@@ Line 1: / Line 1: @@
 == Commands ==
   env  = Shows you the environment variables that are currently defined.
@@ Line 9: / Line 12: @@
   BAR=Love
-=== Example #2 - Derefrencing ===
+=== Example #2 - De-refrencing ===
 To get the value of the variable (i.e. dereference) you place a '$' before the variable name.
@@ Line 16: / Line 19: @@
   #echo $BAR
   #Love
 == Quiz ==

@@ Line 1: / Line 1: @@
-=== Assignment and Dereferencing ===
+== Commands ==
 To assign a value to an environment variable you simply type the variable name, '=', then the value. For example,
   FOO=Rob
   BAR=Love
 To get the value of the variable (i.e. dereference) you place a '$' before the variable name.
@@ Line 11: / Line 17: @@
   #Love
-=== Commands ===
+== Quiz ==
 # What is the value of the "USER" environment variable?
 # What is the value of the "HOSTNAME" environment variable?
@@ Line 23: / Line 25: @@
 # Using the GEEK environment variable, how would you echo the statement, "I think that FREE GEEK is the best!"?
 # Can you tab-complete environment variables?
 [[Category:CLI Quizes]]
 [[Category:Classes]]

@@ Line 16: / Line 16: @@
 === Quiz ===
 # What is the value of the "HOME" environment variable?
 # How would you create an environment variable named GEEK that has the contents- "FREE GEEK is the best!"?
 # Using the GEEK environment variable, how would you echo the statement, "I think that FREE GEEK is the best!"?
 [[Category:CLI Quizes]]
 [[Category:Classes]]