Introduction to Linux in HPC/Shell scripting - Revision history

Marc-andre-hermanns-bc32@rwth-aachen.de: Tweak page sorting

2020-12-04T15:24:38Z

Tweak page sorting

2020-12-04T15:07:19Z

Fix DISPLAYTITLE

2020-12-01T13:34:24Z

Change to multiple collapsible questions

2020-12-01T13:18:11Z

spelling

2020-12-01T13:17:06Z

Add question about CL args

2020-12-01T13:00:23Z

Add question about shebang

2020-12-01T12:47:25Z

Add question about starting a shell script

2020-12-01T11:22:36Z

Re-structure Ex.1 a bit; Capital C in Ex.6

2020-12-01T11:13:02Z

Add opening text

2020-11-23T08:48:45Z

Fit video canvas to 16:9 ratio

@@ Line 1: / Line 1: @@
-[[Category:Tutorials]]<nowiki />
+[[Category:Tutorials|Shell Scripting]]<nowiki />
 {{DISPLAYTITLE:Shell Scripting}}<nowiki />
 {{Syllabus Introduction to Linux}}<nowiki />

@@ Line 1: / Line 1: @@
 [[Category:Tutorials]]<nowiki />
-{{DISPLAYTITLE:<span style="position:absolute; top:-9999px;">Introduction to Linux in HPC/</span>Shell scripting}}<nowiki />
+{{DISPLAYTITLE:Shell Scripting}}<nowiki />
 {{Syllabus Introduction to Linux}}<nowiki />
 __TOC__

@@ Line 15: / Line 15: @@
 {{hidden begin
-|title = Questions
+|title = Which command rund the executable script "test.sh" located in your home folder?
 }}
 <quiz display=simple>
-{Which command rund the executable script "test.sh" located in your home folder?
 |type="[]"}
 -  <code>~$ test.sh</code>
@@ Line 27: / Line 26: @@
 +  <code>~$ ~/test.sh</code>
 || Explanation: The <code>~/</code> refers to the path of your home directory. This is equivalent to the full path of <code>/home/<USERNAME>/</code>.
-{Which bash command below assigns "value" to variable var?
+{{hidden begin
 |type="()"}
 +  <code>var="value"</code>
@@ Line 35: / Line 40: @@
 ||
 -  <code>var=="value"</code>
 ||
-{What do you have to add to the header of a script to make it an '''executable''' bash script?
+{{hidden begin
 |type="()"}
 - <code>#BASH</code>
@@ Line 45: / Line 56: @@
 + <code>#!/bin/bash</code>
 || Explanation: This is referred to as the ''shebang''.
-{How can you de-reference the second command-line argument in a script when calling <code>~$ ./test.sh arg1 arg2 arg3</code>?
+{{hidden begin
 |type="()"}
 - <code>$arg2</code>

@@ Line 55: / Line 55: @@
 ||
 + <code>$2</code>
-|| Explanation: Command-line arguments start to count at 0, however the 0th element is the script-name itself there the second argument is arg2 in this case which can be accessed/de-referenced in the script with <code>$2</code>
+|| Explanation: Command-line arguments start to count at 0, however the 0th element is the script-name itself therefore the second argument is arg2 in this case which can be accessed/de-referenced in the script with <code>$2</code>
 - <code>$0</code>
 ||

@@ Line 45: / Line 45: @@
 + <code>#!/bin/bash</code>
 || Explanation: This is referred to as the ''shebang''.
 </quiz>

@@ Line 36: / Line 36: @@
 -  <code>var=="value"</code>
 ||
 </quiz>
 {{hidden end}}

@@ Line 33: / Line 33: @@
-. a. Write a script that
+. Write a script that:
-     b. Prints an environment variable
+     a. Prints an environment variable
-     c. Saves the output of the date command to a variable
+     b. Saves the output of the '''date''' command to a variable
-     d. Sleeps briefly
+     c. Sleeps for 2 seconds
-     e. Prints the new and old date and time
+     d. Prints the new and old date and time
     {| role="presentation" class="wikitable mw-collapsible mw-collapsed"
      | <strong>Answer:</strong>
@@ Line 136: / Line 136: @@
      |}
-. create an shell variable MYIDENTITY and export it as below:
+. Create an shell variable MYIDENTITY and export it as below:
      <code>$ export MYIDENTITY=whoami</code>
      How will you list the shell variable MYIDENTITY?

@@ Line 3: / Line 3: @@
 {{Syllabus Introduction to Linux}}<nowiki />
 __TOC__
 === Video === <!--T:5-->

@@ Line 6: / Line 6: @@
 === Video === <!--T:5-->
-<youtube width="600" height="400" right>aNybqywxt9Y</youtube>
+<youtube width="600" height="340" right>aNybqywxt9Y</youtube>
 ([[Media:HPC.NRW_Introduction_to_Linux_in_HPC_09_Shell_scripts.pdf | Slides as pdf]])